Mertes, F.; Kneip, N.; Heinke, R.; Kieck, T.; Studer, D. et al.: Ion implantation of 226Ra for a primary 222Rn emanation standard. In: Applied radiation and isotopes : a journal of nuclear and radiation techniques and their applications in the physical, chemical, biological, medical, earth, planetary, environmental and engineering science 181 (2022), 110093. DOI:
https://doi.org/10.1016/j.apradiso.2021.110093
Zusammenfassung: |
Laser resonance ionization at the RISIKO 30 kV mass separator has been used to produce isotopically and isobarically pure and well quantified 222Rn emanation standards. Based upon laser-spectroscopic preparation studies, ion implantation into aluminum and tungsten targets has been carried out, providing overall implantation efficiencies of 40% up to 60%. The absolute implanted activity of 226Ra was determined by the technique of defined solid-angle α-particle spectrometry, where excellent energy resolution was observed. The 222Rn emanation coefficient of the produced targets was studied using α-particle and γ-ray spectrometry, and yielded results between 0.23 and 0.34, with relative uncertainty on the order of 1%. No dependence exceeding a 1% change of the emanation on humidity could be identified in the range of 15 %rH to 75 %rH, whereas there were hints of a slight correlation between the emanation and temperature. Additionally, and as expected, the emanation coefficient was found to be dependent on the target material as well as the implanted dose. © 2021
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Lizenzbestimmungen: |
CC BY 4.0 Unported - https://creativecommons.org/licenses/by/4.0/
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Publikationstyp: |
Article |
Publikationsstatus: |
publishedVersion |
Erstveröffentlichung: |
2022 |
Schlagwörter (englisch): |
222Rn emanation, Defined solid-angle alpha-particle spectrometry, Ion implantation, Laser ionization
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Fachliche Zuordnung (DDC): |
530 | Physik, 610 | Medizin, Gesundheit, 540 | Chemie
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