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McLain J, Gott M, Greene J, Scott R, Vondrasek R. Sputter sample preparation for ion beam delivery of radium-223 at ATLAS. Rev Sci Instrum 2023; 94:063301. [PMID: 37862488 DOI: 10.1063/5.0137098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 05/23/2023] [Indexed: 10/22/2023]
Abstract
A radium-223 ion beam was delivered to an experiment from the electron cyclotron resonance ion source, ECR2, at the Argonne Tandem Linac Accelerator System (ATLAS). The radium-223 material was in a nitrate salt form within a vial, prior to being converted to a usable sputter sample. The sputter sample was produced using a new sample preparation method, where the radium nitrate was dissolved into a solution and pipetted onto pressed aluminum powder. This sample was then allowed to dry, distributing the radium-223 material throughout the sputter sample. Ion source operation using the radium sputter sample is described with the operating parameters listed. The intensity and energy requirements for this ion beam were 1 × 106 particles/s and 1.07 GeV, respectively. Because the intensity is relatively low compared to most experiments at ATLAS, previously developed accelerator mass spectrometry methods were used Scott et al. [Rev. Sci. Instrum. 87, 02A732 (2016)] to avoid the need for tuning of the low-intensity beam of interest. Handling of the radium material, as well as loading and unloading of the sputter sample from ECR2, required collaboration with Health Physics. Procedures were used and dry runs were carried out before, during, and after the experiment to ensure the safety of the workers. The processes used and lessons learned are described within.
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Affiliation(s)
- J McLain
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M Gott
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - J Greene
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - R Scott
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - R Vondrasek
- Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
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Gilbert JA, Gershman DJ, Gloeckler G, Lundgren RA, Zurbuchen TH, Orlando TM, McLain J, von Steiger R. Invited article: Characterization of background sources in space-based time-of-flight mass spectrometers. Rev Sci Instrum 2014; 85:091301. [PMID: 25273700 DOI: 10.1063/1.4894694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
For instruments that use time-of-flight techniques to measure space plasma, there are common sources of background signals that evidence themselves in the data. The background from these sources may increase the complexity of data analysis and reduce the signal-to-noise response of the instrument, thereby diminishing the science value or usefulness of the data. This paper reviews several sources of background commonly found in time-of-flight mass spectrometers and illustrates their effect in actual data using examples from ACE-SWICS and MESSENGER-FIPS. Sources include penetrating particles and radiation, UV photons, energy straggling and angular scattering, electron stimulated desorption of ions, ion-induced electron emission, accidental coincidence events, and noise signatures from instrument electronics. Data signatures of these sources are shown, as well as mitigation strategies and design considerations for future instruments.
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Affiliation(s)
- J A Gilbert
- Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward St, Ann Arbor, Michigan 48109, USA
| | - D J Gershman
- Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward St, Ann Arbor, Michigan 48109, USA
| | - G Gloeckler
- Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward St, Ann Arbor, Michigan 48109, USA
| | - R A Lundgren
- Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward St, Ann Arbor, Michigan 48109, USA
| | - T H Zurbuchen
- Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 2455 Hayward St, Ann Arbor, Michigan 48109, USA
| | - T M Orlando
- Georgia Institute of Technology, 225 North Ave NW, Atlanta, Georgia 30332, USA
| | - J McLain
- Georgia Institute of Technology, 225 North Ave NW, Atlanta, Georgia 30332, USA
| | - R von Steiger
- International Space Science Institute, Hallerstrasse 6, CH-3012 Bern, Switzerland and Physikalisches Institut, Universität Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
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Abstract
The study assessed the impact of test feedback about one partner on both members of male-female couples. Twenty-four males and 24 females ("participants") took an inkblot test and received a standard personality interpretation-purportedly derived from the test-in the presence of a partner (the "observer"). Half the pairs were strangers; the other half defined themselves as intimate friends. Intimate couples rated the feedback as more accurate, remembered more of the feedback, reported more faith in psychological tests, and rated experimenter skill higher than did strangers. Male participants rated the feedback as more accurate than did male observers. Males may be more receptive of feedback in couples when they themselves have taken the test.
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Affiliation(s)
- M M Handelsman
- Department of Psychology, University of Colorado, Denver 80204
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Abstract
A 62-year-old female who had received prolonged iodine therapy for asthma presented with severe thyrotoxicosis and severe asthma. Her history, elevated serum thyroxine and triiodothyronine, low 131I uptake, and elevated intrathyroidal iodine content by fluorescent scan were most consistent wiht a diagnosis of iodine-induced thyrotoxicosis (IITT). The clinical course of her thyrotoxicosis was protracted, and in spite of its etiologic role in the precipitaton of thyrotoxicosos, iodine was therapeutically efficacious, although combined treatment with methimazole was required to ultimately restore euthyroidism. Therapy with lithium was also employed but appeared to be only transiently effective and combined no additional decrement in serum T4 than that seen with iodine alone. The case exemplifies the heterogeneity of what is considered "iodine-induced" thyrotoxicosis, the complexities inherent in establishing a diagnosis of IITT, and the use of other rapid acting pharmacologic agents in IITT when beta blockade is contraindicated by asthma.
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Cottrell TL, Dobbie RC, McLain J, Read AW. Transition probabilities in molecular encounters. Part 7.—Further evidence for vibrational-rotational energy transfer. Relaxation in AsH3and AsD3. ACTA ACUST UNITED AC 1964. [DOI: 10.1039/tf9646000241] [Citation(s) in RCA: 27] [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] [Indexed: 11/21/2022]
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