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Király B, Domonkos A, Jelitai M, Lopes-Dos-Santos V, Martínez-Bellver S, Kocsis B, Schlingloff D, Joshi A, Salib M, Fiáth R, Barthó P, Ulbert I, Freund TF, Viney TJ, Dupret D, Varga V, Hangya B. Author Correction: The medial septum controls hippocampal supra-theta oscillations. Nat Commun 2023; 14:7584. [PMID: 37989730 PMCID: PMC10663444 DOI: 10.1038/s41467-023-43190-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023] Open
Affiliation(s)
- Bálint Király
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Department of Biological Physics, Institute of Physics, Eötvös Loránd University, Budapest, Hungary
| | - Andor Domonkos
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Márta Jelitai
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Vítor Lopes-Dos-Santos
- Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Sergio Martínez-Bellver
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Department of Anatomy and Human Embryology, Faculty of Medicine and Odontology, University of Valencia, Valencia, Spain
| | - Barnabás Kocsis
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Dániel Schlingloff
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Abhilasha Joshi
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Minas Salib
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Richárd Fiáth
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter Barthó
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - István Ulbert
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Tamás F Freund
- Laboratory of Cerebral Cortex Research, Institute of Experimental Medicine, Budapest, Hungary
| | - Tim J Viney
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - David Dupret
- Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Viktor Varga
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Balázs Hangya
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary.
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Király B, Domonkos A, Jelitai M, Lopes-Dos-Santos V, Martínez-Bellver S, Kocsis B, Schlingloff D, Joshi A, Salib M, Fiáth R, Barthó P, Ulbert I, Freund TF, Viney TJ, Dupret D, Varga V, Hangya B. The medial septum controls hippocampal supra-theta oscillations. Nat Commun 2023; 14:6159. [PMID: 37816713 PMCID: PMC10564782 DOI: 10.1038/s41467-023-41746-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 09/15/2023] [Indexed: 10/12/2023] Open
Abstract
Hippocampal theta oscillations orchestrate faster beta-to-gamma oscillations facilitating the segmentation of neural representations during navigation and episodic memory. Supra-theta rhythms of hippocampal CA1 are coordinated by local interactions as well as inputs from the entorhinal cortex (EC) and CA3 inputs. However, theta-nested gamma-band activity in the medial septum (MS) suggests that the MS may control supra-theta CA1 oscillations. To address this, we performed multi-electrode recordings of MS and CA1 activity in rodents and found that MS neuron firing showed strong phase-coupling to theta-nested supra-theta episodes and predicted changes in CA1 beta-to-gamma oscillations on a cycle-by-cycle basis. Unique coupling patterns of anatomically defined MS cell types suggested that indirect MS-to-CA1 pathways via the EC and CA3 mediate distinct CA1 gamma-band oscillations. Optogenetic activation of MS parvalbumin-expressing neurons elicited theta-nested beta-to-gamma oscillations in CA1. Thus, the MS orchestrates hippocampal network activity at multiple temporal scales to mediate memory encoding and retrieval.
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Affiliation(s)
- Bálint Király
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Department of Biological Physics, Institute of Physics, Eötvös Loránd University, Budapest, Hungary
| | - Andor Domonkos
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Márta Jelitai
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Vítor Lopes-Dos-Santos
- Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Sergio Martínez-Bellver
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Department of Anatomy and Human Embryology, Faculty of Medicine and Odontology, University of Valencia, Valencia, Spain
| | - Barnabás Kocsis
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
| | - Dániel Schlingloff
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Abhilasha Joshi
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Minas Salib
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - Richárd Fiáth
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Péter Barthó
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - István Ulbert
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Budapest, Hungary
- Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Tamás F Freund
- Laboratory of Cerebral Cortex Research, Institute of Experimental Medicine, Budapest, Hungary
| | - Tim J Viney
- Department of Pharmacology, University of Oxford, Oxford, UK
| | - David Dupret
- Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | - Viktor Varga
- Subcortical Modulation Research Group, Institute of Experimental Medicine, Budapest, Hungary
| | - Balázs Hangya
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary.
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3
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Hegedüs P, Sviatkó K, Király B, Martínez-Bellver S, Hangya B. Cholinergic activity reflects reward expectations and predicts behavioral responses. iScience 2022; 26:105814. [PMID: 36636356 PMCID: PMC9830220 DOI: 10.1016/j.isci.2022.105814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/22/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Basal forebrain cholinergic neurons (BFCNs) play an important role in associative learning, suggesting that BFCNs may participate in processing stimuli that predict future outcomes. However, the impact of outcome probabilities on BFCN activity remained elusive. Therefore, we performed bulk calcium imaging and recorded spiking of identified cholinergic neurons from the basal forebrain of mice performing a probabilistic Pavlovian cued outcome task. BFCNs responded more to sensory cues that were often paired with reward. Reward delivery also activated BFCNs, with surprising rewards eliciting a stronger response, whereas punishments evoked uniform positive-going responses. We propose that BFCNs differentially weigh predictions of positive and negative reinforcement, reflecting divergent relative salience of forecasting appetitive and aversive outcomes, partially explained by a simple reinforcement learning model of a valence-weighed unsigned prediction error. Finally, the extent of cue-driven cholinergic activation predicted subsequent decision speed, suggesting that the expectation-gated cholinergic firing is instructive to reward-seeking behaviors.
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Affiliation(s)
- Panna Hegedüs
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, H-1083 Budapest, Hungary,János Szentágothai Doctoral School of Neurosciences, Semmelweis University, H-1085 Budapest, Hungary
| | - Katalin Sviatkó
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, H-1083 Budapest, Hungary,János Szentágothai Doctoral School of Neurosciences, Semmelweis University, H-1085 Budapest, Hungary
| | - Bálint Király
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, H-1083 Budapest, Hungary,Department of Biological Physics, Eötvös Loránd University, H-1117 Budapest, Hungary
| | - Sergio Martínez-Bellver
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, H-1083 Budapest, Hungary,Department of Anatomy and Human Embryology, Faculty of Medicine and Odontology, University of Valencia, 46010 Valencia, Spain
| | - Balázs Hangya
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, H-1083 Budapest, Hungary,Corresponding author
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Király B, Balázsfi D, Horváth I, Solari N, Sviatkó K, Lengyel K, Birtalan E, Babos M, Bagaméry G, Máthé D, Szigeti K, Hangya B. In vivo localization of chronically implanted electrodes and optic fibers in mice. Nat Commun 2020; 11:4686. [PMID: 32943633 PMCID: PMC7499215 DOI: 10.1038/s41467-020-18472-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 08/24/2020] [Indexed: 12/20/2022] Open
Abstract
Electrophysiology provides a direct readout of neuronal activity at a temporal precision only limited by the sampling rate. However, interrogating deep brain structures, implanting multiple targets or aiming at unusual angles still poses significant challenges for operators, and errors are only discovered by post-hoc histological reconstruction. Here, we propose a method combining the high-resolution information about bone landmarks provided by micro-CT scanning with the soft tissue contrast of the MRI, which allowed us to precisely localize electrodes and optic fibers in mice in vivo. This enables arbitrating the success of implantation directly after surgery with a precision comparable to gold standard histology. Adjustment of the recording depth with micro-drives or early termination of unsuccessful experiments saves many working hours, and fast 3-dimensional feedback helps surgeons avoid systematic errors. Increased aiming precision enables more precise targeting of small or deep brain nuclei and multiple targeting of specific cortical or hippocampal layers.
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Affiliation(s)
- Bálint Király
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
- Department of Biological Physics, Eötvös Loránd University, Budapest, Hungary
| | - Diána Balázsfi
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Ildikó Horváth
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Nicola Solari
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Katalin Sviatkó
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
- János Szentágothai Doctoral School of Neurosciences, Semmelweis University, Budapest, Hungary
| | - Katalin Lengyel
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Eszter Birtalan
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary
| | - Magor Babos
- Mediso Medical Imaging Systems Ltd., Budapest, Hungary
| | | | - Domokos Máthé
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
- CROmed Translational Research Centers, Budapest, Hungary
| | - Krisztián Szigeti
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Balázs Hangya
- Lendület Laboratory of Systems Neuroscience, Institute of Experimental Medicine, Budapest, Hungary.
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5
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Tőkési N, Kozák E, Fülöp K, Dedinszki D, Hegedűs N, Király B, Szigeti K, Ajtay K, Jakus Z, Zaworski J, Letavernier E, Pomozi V, Váradi A. Pyrophosphate therapy prevents trauma-induced calcification in the mouse model of neurogenic heterotopic ossification. J Cell Mol Med 2020; 24:11791-11799. [PMID: 32885586 PMCID: PMC7579705 DOI: 10.1111/jcmm.15793] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/19/2020] [Accepted: 07/31/2020] [Indexed: 12/18/2022] Open
Abstract
Trauma‐induced calcification is the pathological consequence of complex injuries which often affect the central nervous system and other parts of the body simultaneously. We demonstrated by an animal model recapitulating the calcification of the above condition that adrenaline transmits the stress signal of brain injury to the calcifying tissues. We have also found that although the level of plasma pyrophosphate, the endogenous inhibitor of calcification, was normal in calcifying animals, it could not counteract the acute calcification. However, externally added pyrophosphate inhibited calcification even when it was administered after the complex injuries. Our finding suggests a potentially powerful clinical intervention of calcification triggered by polytrauma injuries which has no effective treatment.
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Affiliation(s)
- Natália Tőkési
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Eszter Kozák
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Krisztina Fülöp
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Dóra Dedinszki
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Nikolett Hegedűs
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Bálint Király
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary.,Department of Cellular and Network Neurobiology, Institute of Experimental Medicine, Budapest, Hungary
| | - Krisztián Szigeti
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Kitti Ajtay
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Zoltán Jakus
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Jeremy Zaworski
- Sorbonne Université, UPMC Univ Paris 06, Paris, France.,INSERM, UMR S 1155, Paris, France
| | - Emmanuel Letavernier
- Sorbonne Université, UPMC Univ Paris 06, Paris, France.,INSERM, UMR S 1155, Paris, France
| | - Viola Pomozi
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - András Váradi
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
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Szabó ER, Reisz Z, Polanek R, Tőkés T, Czifrus S, Pesznyák C, Biró B, Fenyvesi A, Király B, Molnár J, Brunner S, Daroczi B, Varga Z, Hideghéty K. A novel vertebrate system for the examination and direct comparison of the relative biological effectiveness for different radiation qualities and sources. Int J Radiat Biol 2018; 94:985-995. [PMID: 30332320 DOI: 10.1080/09553002.2018.1511928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
PURPOSE The recent rapid increase of hadron therapy applications requires the development of high performance, reliable in vivo models for preclinical research on the biological effects of high linear energy transfer (LET) particle radiation. AIM The aim of this paper was to test the relative biological effectiveness (RBE) of the zebrafish embryo system at two neutron facilities. MATERIAL AND METHODS Series of viable zebrafish embryos at 24-hour post-fertilization (hpf) were exposed to single fraction, whole-body, photon and neutron (reactor fission neutrons (<En = 1 MeV>) and (p (18 MeV)+Be, <En> = 3.5 MeV) fast neutron) irradiation. The survival and morphologic abnormalities of each embryo were assessed at 24-hour intervals from the point of fertilization up to 192 hpf and then compared to conventional 6 MV photon beam irradiation results. RESULTS The higher energy of the fast neutron beams represents lower RBE (ref. source LINAC 6 MV photon). The lethality rate in the zebrafish embryo model was 10 times higher for 1 MeV fission neutrons and 2.5 times greater for p (18 MeV)+Be cyclotron generated fast neutron beam when compared to photon irradiation results. Dose-dependent organ perturbations (shortening of the body length, spine curvature, microcephaly, micro-ophthalmia, pericardial edema and inhibition of yolk sac resorption) and microscopic (marked cellular changes in eyes, brain, liver, muscle and the gastrointestinal system) changes scale together with the dose response. CONCLUSION The zebrafish embryo system is a powerful and versatile model for assessing the effect of ionizing radiation with different LET values on viability, organ and tissue development.
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Affiliation(s)
- E R Szabó
- a Extreme Light Infrastructure - Attosecond Light Pulse Source, ELI-HU Non-Profit Ltd , Szeged , Hungary
| | - Z Reisz
- b Department of Pathology , University of Szeged , Szeged , Hungary
| | - R Polanek
- a Extreme Light Infrastructure - Attosecond Light Pulse Source, ELI-HU Non-Profit Ltd , Szeged , Hungary
| | - T Tőkés
- a Extreme Light Infrastructure - Attosecond Light Pulse Source, ELI-HU Non-Profit Ltd , Szeged , Hungary
| | - Sz Czifrus
- c Budapest University of Technology and Economics Institute of Nuclear Techniques , Budapest , Hungary
| | - Cs Pesznyák
- c Budapest University of Technology and Economics Institute of Nuclear Techniques , Budapest , Hungary
| | - B Biró
- d Hungarian Academy of Sciences Institute for Nuclear Research (MTA Atomki) , Debrecen , Hungary
| | - A Fenyvesi
- d Hungarian Academy of Sciences Institute for Nuclear Research (MTA Atomki) , Debrecen , Hungary
| | - B Király
- d Hungarian Academy of Sciences Institute for Nuclear Research (MTA Atomki) , Debrecen , Hungary
| | - J Molnár
- d Hungarian Academy of Sciences Institute for Nuclear Research (MTA Atomki) , Debrecen , Hungary
| | - Sz Brunner
- a Extreme Light Infrastructure - Attosecond Light Pulse Source, ELI-HU Non-Profit Ltd , Szeged , Hungary
| | - B Daroczi
- e Department of Internal Medicine, Division of Geriatrics , University of Debrecen , Debrecen , Hungary
| | - Z Varga
- f Department of Oncotherapy , University of Szeged , Szeged , Hungary
| | - K Hideghéty
- a Extreme Light Infrastructure - Attosecond Light Pulse Source, ELI-HU Non-Profit Ltd , Szeged , Hungary.,f Department of Oncotherapy , University of Szeged , Szeged , Hungary
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Tárkányi F, Ditrói F, Takács S, Hermanne A, Király B. Activation cross-section data for alpha-particle induced nuclear reactions on natural ytterbium for some longer lived radioisotopes. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5139-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Tárkányi F, Ditrói F, Király B, Takács S, Hermanne A, Yamazaki H, Baba M, Mohammadi A, Ignatyuk A. Study of activation cross sections of proton induced reactions on barium: Production of 131Ba→131Cs. Appl Radiat Isot 2010; 68:1869-77. [DOI: 10.1016/j.apradiso.2010.03.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 01/20/2010] [Accepted: 03/08/2010] [Indexed: 10/19/2022]
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Tárkányi F, Hermanne A, Takács S, Sonck M, Szucs Z, Király B, Ignatyuk AV. Investigation of alternative production routes of 99mTc: deuteron induced reactions on 100 Mo. Appl Radiat Isot 2010; 69:18-25. [PMID: 20817541 DOI: 10.1016/j.apradiso.2010.08.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 07/29/2010] [Accepted: 08/09/2010] [Indexed: 10/19/2022]
Abstract
Activation cross sections of deuteron induced nuclear reactions on enriched (100)Mo have been studied up to 50 MeV using the stacked foil irradiation technique and gamma spectroscopy. The excitation functions for production of (99m)Tc, (ind99)Mo, (ind98m)Nb, (ind97mg)Nb radioisotopes were measured for the first time and compared with the results of the ALICE-D, EMPIRE-D and TALYS codes. Production possibilities of the medically important (99m)Tc are discussed.
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Affiliation(s)
- F Tárkányi
- Institute of Nuclear Research, Hungarian Academy of Sciences (ATOMKI), 4026 Debrecen, Bem ter 18/c, Hungary
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Tárkányi F, Hermanne A, Király B, Takács S, Ignatyuk A. Study of excitation functions of alpha-particle induced nuclear reactions on holmium for 167Tm production. Appl Radiat Isot 2010; 68:404-11. [PMID: 20022515 DOI: 10.1016/j.apradiso.2009.11.043] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2009] [Revised: 11/23/2009] [Accepted: 11/23/2009] [Indexed: 10/20/2022]
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11
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Tárkányi F, Hermanne A, Takács S, Ditrói F, Király B, Yamazaki H, Baba M, Mohammadi A, Ignatyuk A. New measurements and evaluation of excitation functions for (p,xn), (p,pxn) and (p,2pxn) reactions on 133Cs up to 70MeV proton energy. Appl Radiat Isot 2010; 68:47-58. [DOI: 10.1016/j.apradiso.2009.09.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Revised: 08/18/2009] [Accepted: 09/28/2009] [Indexed: 10/20/2022]
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Tárkányi F, Hermanne A, Takács S, Király B, Spahn I, Ignatyuk AV. Experimental study of the excitation functions of proton induced nuclear reactions on (167)Er for production of medically relevant (167)Tm. Appl Radiat Isot 2009; 68:250-5. [PMID: 19932028 DOI: 10.1016/j.apradiso.2009.10.043] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 10/19/2009] [Accepted: 10/19/2009] [Indexed: 11/18/2022]
Abstract
(167)Tm (T(1/2)=9.25d) is a candidate radioisotope for medical therapy and diagnostics due to its Auger-electron and low-energy X- and gamma-ray emission. Excitation functions of the (167)Er(p,n)(167)Tm reaction and (168)Er(p,n)(168)Tm, (167)Er(p,2n)(166)Tm, (166)Er(p,2n)(165)Tm disturbing reactions were measured up to 15MeV by using the stacked foil irradiation technique and gamma-ray spectroscopy. The measured excitation functions agree well with the results of ALICE-IPPE, EMPIRE-II and TALYS nuclear reaction model codes. The thick target yield of (167)Tm in the 15-8MeV energy range is 6.9MBq/microAh. A short comparison of charged particle production routes of (167)Tm is given.
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Affiliation(s)
- F Tárkányi
- Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), 4026 Debrecen, Bem ter 18/c, Hungary
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Tárkányi F, Hermanne A, Király B, Takács S, Ditrói F, Csikai J, Fenyvesi A, Uddin M, Hagiwara M, Baba M, Ido T, Shubin Y, Ignatyuk A. New cross-sections for production of 103Pd; review of charged particle production routes. Appl Radiat Isot 2009; 67:1574-81. [DOI: 10.1016/j.apradiso.2009.03.100] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Revised: 03/10/2009] [Accepted: 03/20/2009] [Indexed: 11/25/2022]
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Tárkányi F, Takács S, Hermanne A, Ditrói F, Király B, Baba M, Ohtsuki T, Kovalev S, Ignatyuk A. Investigation of production of the therapeutic radioisotope 165Er by proton induced reactions on erbium in comparison with other production routes. Appl Radiat Isot 2009; 67:243-7. [DOI: 10.1016/j.apradiso.2008.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2008] [Revised: 10/15/2008] [Accepted: 10/16/2008] [Indexed: 10/21/2022]
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Tárkányi F, Hermanne A, Takács S, Ditrói F, Király B, Baba M, Ohtsuki T, Kovalev SF, Ignatyuk AV. Study of activation cross sections of deuteron-induced reactions on erbium for applications. J Labelled Comp Radiopharm 2007. [DOI: 10.1002/jlcr.1213] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
Principles and techniques of some neutron-based methods used to identify the antipersonnel landmines (APMs) are discussed. New results have been achieved in the field of neutron reflection, transmission, scattering and reaction techniques. Some conclusions are as follows: The neutron hand-held detector is suitable for the observation of anomaly caused by a DLM2-like sample in different soils with a scanning speed of 1m(2)/1.5 min; the reflection cross section of thermal neutrons rendered the determination of equivalent thickness of different soil components possible; a simple method was developed for the determination of the thermal neutron flux perturbation factor needed for multi-elemental analysis of bulky samples; unfolded spectra of elastically backscattered neutrons using broad-spectrum sources render the identification of APMs possible; the knowledge of leakage spectra of different source neutrons is indispensable for the determination of the differential and integrated reaction rates and through it the dimension of the interrogated volume; the precise determination of the C/O atom fraction requires the investigations on the angular distribution of the 6.13MeV gamma-ray emitted in the (16)O(n,n'gamma) reaction. These results, in addition to the identification of landmines, render the improvement of the non-intrusive neutron methods possible.
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Affiliation(s)
- J Csikai
- Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O.B. 51, Debrecen H-4001, Hungary.
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17
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Abstract
Systematic investigations have been carried out to extend the thermal neutron activation method for elemental analysis of bulk samples. A new method developed for the determination of the flux perturbation factor renders the thermal and epithermal neutron activation analyses of bulky samples of unknown compositions possible both in hydrogenous and in graphite moderators. The flux perturbation, F, depression, H, and self-absorption, G, factors are given for different samples. The limitation of the epithermal neutron activation analysis for hydrogenous bulky samples is also discussed.
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Affiliation(s)
- B Király
- Institute of Experimental Physics, University of Debrecen, 4010 Debrecen-10, Pf. 105, Hungary.
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18
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19
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Abstract
The prompt neutron detection and the foil activation methods were compared for the determination of the reflection cross-section of thermal neutrons and the hydrogen content of bulk samples. The advantages and limitations of the two methods are discussed.
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Affiliation(s)
- B Király
- Institute of Experimental Physics, Kossuth University, Debrecen, Hungary
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