Precision imaging of 4.4 MeV gamma rays using a 3-D position sensitive Compton camera.

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2018
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Abstract
Imaging of nuclear gamma-ray lines in the 1-10 MeV range is far from being established in both medical and physical applications. In proton therapy, 4.4 MeV gamma rays are emitted from the excited nucleus of either C* or B* and are considered good indicators of dose delivery and/or range verification. Further, in gamma-ray astronomy, 4.4 MeV gamma rays are produced by cosmic ray interactions in the interstellar medium, and can thus be used to probe nucleothynthesis in the universe. In this paper, we present a high-precision image of 4.4 MeV gamma rays taken by newly developed 3-D position sensitive Compton camera (3D-PSCC). To mimic the situation in proton therapy, we first irradiated water, PMMA and Ca(OH)2 with a 70 MeV proton beam, then we identified various nuclear lines with the HPGe detector. The 4.4 MeV gamma rays constitute a broad peak, including single and double escape peaks. Thus, by setting an energy window of 3D-PSCC from 3 to 5 MeV, we show that a gamma ray image sharply concentrates near the Bragg peak, as expected from the minimum energy threshold and sharp peak profile in the cross section of C(p,p)C*.
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koide2018precisionscientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Koide, Ayako;Kataoka, Jun;Masuda, Takamitsu;Mochizuki, Saku;Taya, Takanori;Sueoka, Koki;Tagawa, Leo;Fujieda, Kazuya;Maruhashi, Takuya;Kurihara, Takuya;Inaniwa, Taku;
Journal Scientific reports
Year 2018
DOI
10.1038/s41598-018-26591-2
URL
Keywords
epiphora medial canthal incision medial canthus medial orbit orbitotomy transcaruncular transcutaneous

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