Yokoyama Sumi, Sato Kaoru, Noguchi Hiroshi, Tanaka Susumu, Iida Takao, Furuichi Shinya, Kanda Yukio, Oki Yuichi, Kaneto Taihei
Tokai Research Establishment, Japan Atomic Energy Research Institute, 2-4 Shirane, Shirakata, Tokai-mura, Ibaraki 319-1195, Japan.
Radiat Prot Dosimetry. 2005;116(1-4 Pt 2):401-5. doi: 10.1093/rpd/nci020.
The physicochemical properties of radionuclides suspended in the air are important parameters in order to evaluate internal doses due to the inhalation of the airborne radionuclides and to develop the air-monitoring system in high-energy proton accelerator facilities. This study focuses on the property of radioactive airborne chlorine (38Cl and 39Cl) and sulphur (38S) produced in Ar gas by irradiation with high-energy neutrons. As a result of the irradiation of a mixture of Ar gas and dry air, 38Cl and 39Cl existed as non-acidic gas and 38S was present as acidic gas. Furthermore, it has been found that in the high-energy neutron irradiation of aerosol containing Ar gas, the higher the amount of radioactive aerosols, the lower will be the amount of radioactive acidic gas.
悬浮在空气中的放射性核素的物理化学性质是评估因吸入空气中的放射性核素而产生的内照射剂量以及开发高能质子加速器设施中的空气监测系统的重要参数。本研究聚焦于高能中子辐照氩气时产生的放射性气态氯（³⁸Cl和³⁹Cl）和硫（³⁸S）的性质。在用氩气和干燥空气的混合物进行辐照的过程中，³⁸Cl和³⁹Cl以非酸性气体形式存在，³⁸S以酸性气体形式存在。此外，还发现，在含有氩气的气溶胶的高能中子辐照中，放射性气溶胶的量越高，放射性酸性气体的量就越低。
