Journal Article

FZJ-2025-03942

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Positron emission intensity in the decay of 72As for use in PET studies

Hussain, M. (Corresponding author)FZJ* ; Koers, L. M. g.FZJ* ; Spahn, I.FZJ* ; Spellerberg, S.FZJ* ; Neumaier, B.FZJ* ; Qaim, S. M.FZJ*

2025
De Gruyter Berlin

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Please use a persistent id in citations: doi:10.1515/ract-2025-0005

Abstract: 72As is a β+-emitter (T1/2 = 26.0 h; Eβ+ = 1.17 MeV,Iβ+ = 87.8 %) that can be produced at a cyclotron and has significant potential for use in PET studies. Experiments have been undertaken to determine its positron emission intensity with greater precision. Thin enriched 72Ge targets were irradiated with protons of energies around 9 MeV at the cyclotron BC1710 of the Forschungszentrum Jülich. Three different counting methods were used: high-resolution γ-ray spectroscopy, beta counting and X-ray spectroscopy. The major γ-ray peaks of 72As formed via the 72Ge(p,n)72As reaction were analysed to calculate its absolute radioactivity, while the annihilation radiation was characterized by a careful analysis of the 511 keV peak. Beta counting of the same samples was undertaken over a long period of time to validate the results. X-ray counting was also carried out to obtain the integral decay of 72As via electron capture (EC).The measurements furnished a total positron decay (87.3 ± 3.7 %) and total EC decay (12.7 ± 0.6 %). These experimental values agree with those deduced from a detailed evaluation of the decay scheme of 72As.

Note: This work was supported by the Alexander von Humboldt (AvH) Foundation of the Federal Republic of Germany. The author M. Hussain is very grateful to AvH for the research fellowship and funding under its Georg Forster program for senior researchers.

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Contributing Institute(s):

1. Nuklearchemie (INM-5)

Research Program(s):

1. 5253 - Neuroimaging (POF4-525) (POF4-525)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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