Yokoyama S, Sato K, Manabe K, Noguchi H, Kaneko H, Oki Y, Iida T, Tanaka Su
Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
Radiat Prot Dosimetry. 2007;127(1-4):392-7. doi: 10.1093/rpd/ncm475. Epub 2007 Nov 21.
To estimate internal doses due to the inhalation of radionuclides produced by the nuclear spallation of the air nuclei in high-energy proton accelerator facilities, the physicochemical properties of radionuclides are very important. Thus, the ratio of aerosol and gases of 38Cl and 39Cl formed by irradiating argon gas-added air with a 48 MeV proton beam has been measured. Radionuclides of 38Cl and 39Cl exist as aerosol, acid gas and non-acid gas. The percentages of activity of 38Cl and 39Cl aerosols are about 80%. The number size distributions of non-radioactive aerosol were characterised by two peaks with diameters of 10-20 nm and larger than 20 nm. As a result predicted by a simple surface model, it was found that the activity size distribution of 38Cl aerosols can be regarded as that having a single peak at 120 nm.
为估算高能质子加速器设施中空气原子核核散裂产生的放射性核素吸入所致的内照射剂量，放射性核素的物理化学性质非常重要。因此，已测量了用48 MeV质子束辐照添加氩气的空气形成的38Cl和39Cl的气溶胶与气体的比例。38Cl和39Cl的放射性核素以气溶胶、酸性气体和非酸性气体形式存在。38Cl和39Cl气溶胶的活度百分比约为80%。非放射性气溶胶的数量粒径分布以直径为10 - 20 nm和大于20 nm的两个峰为特征。作为简单表面模型预测的结果，发现38Cl气溶胶的活度粒径分布可视为在120 nm处有一个单峰的分布。
