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Bergeron DE, Cessna JT, Fitzgerald RP, Hamad G, Laureano-Pérez L, Pibida L, Zimmerman BE. Liquid scintillation efficiencies, gamma-ray emission intensities, and half-life for Gd-153. Appl Radiat Isot 2024; 203:111108. [PMID: 38000166 DOI: 10.1016/j.apradiso.2023.111108] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 10/23/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023]
Abstract
Gadolinium-153 was standardized for activity by live-timed anticoincidence counting and an ampoule was submitted to the international reference system (SIR). Absolute emission intensities for the main γ rays were determined with calibrated high-purity germanium (HPGe) and lithium-drifted silicon (Si(Li)) detectors. A revised decay scheme is indicated, with no probability of direct electron capture to the 153Eu ground state. Triple-to-double coincidence ratio (TDCR) efficiency curves indicate that the revised decay scheme is consistent with experiment. Half-life measurements agree with a previous NIST determination and show no sensitivity to chemical environment.
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Affiliation(s)
- Denis E Bergeron
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA.
| | - Jeffrey T Cessna
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Ryan P Fitzgerald
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Gulakhshan Hamad
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA; Janssen Pharmaceuticals, Inc., Malvern, PA, 19355, USA
| | - Lizbeth Laureano-Pérez
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Leticia Pibida
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
| | - Brian E Zimmerman
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8462, USA
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Ahmad I, Kondev FG. Decay properties of 2.05-h 95245Am. Appl Radiat Isot 2018; 145:106-108. [PMID: 30593936 DOI: 10.1016/j.apradiso.2018.11.015] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 11/05/2018] [Accepted: 11/24/2018] [Indexed: 11/29/2022]
Abstract
Gamma rays following the β- decay of the 245Am radionuclide (T1/2 = 2.05 h) were measured in early 1970s with a co-axial Ge(Li) detector using a chemically and isotopically pure, mass-separated 245Am source. These data were analyzed in the present work where several weak γ rays in 245Cm were identified. The 245Am decay scheme was deduced and extended when compared to the previously known one.
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Affiliation(s)
- I Ahmad
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - F G Kondev
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA.
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Ferreux L, Lépy MC, Bé MM, Isnard H, Lourenço V. Photon emission intensities in the decay of 108mAg and 110mAg. Appl Radiat Isot 2014; 87:101-6. [PMID: 24369893 DOI: 10.1016/j.apradiso.2013.11.101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 11/20/2013] [Indexed: 11/18/2022]
Abstract
This study focuses on two radioisotopes of silver, (108m)Ag and (110m)Ag, characterized by a complex decay scheme. Each isotope has two disintegration modes, the isomeric transition leading to the daughter isotope ((108)Ag and (110)Ag, respectively) with a short half-life. The radioactive solution was obtained by neutron activation on silver powder enriched in (109)Ag. Gamma-spectrometry was carried out using a calibrated high purity germanium detector. The main relative photon emission intensities for both radionuclides were obtained and compared with previously published values.
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Affiliation(s)
- L Ferreux
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France.
| | - M-C Lépy
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
| | - M-M Bé
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
| | - H Isnard
- CEA, DEN/DANS/DPC/SEARS, Laboratoire de Développement Analytique Nucléaire Isotopique et Elémentaire, PC 33, Gif-sur-Yvette F-91191, France
| | - V Lourenço
- CEA, LIST, Laboratoire National Henri Becquerel, PC 111, Gif-sur-Yvette F-91191, France
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