Yashima H, Uwamino Y, Sugita H, Ito S, Nakamura T, Fukumura A
Cyclotron and Radioisotope Center, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.
Radiat Prot Dosimetry. 2004;112(2):195-208. doi: 10.1093/rpd/nch386. Epub 2004 Jul 27.
Irradiation experiments were performed at the Heavy Ion Medical Accelerator in Chiba (HIMAC) facility, National Institute of Radiological Sciences. The radioactive spallation products in a thick Cu target were obtained for Ar(230, 400 MeV per nucleon), Si(800 MeV per nucleon), Ne(100, 230, 400 MeV per nucleon), C(100, 230, 400 MeV per nucleon), He(100, 230 MeV per nucleon), p(100, 230 MeV) ions. The gamma-ray spectra from irradiated Cu samples inserted into the composite Cu target were measured with a high-purity germanium (HPGe) detector. From the gamma-ray spectra, we obtained the spatial distribution of radioactive yields of spallation products of 40 nuclides in the Cu sample in the Cu target. From the spatial distribution of radioactive yields, we estimated the residual activity and photon dose induced in the Cu target. The residual activity and photon dose become larger with the increase in projectile energy per nucleon and the range of the projectile beam for the same projectile energy per nucleon.
在国立放射科学研究所的千叶重离子医用加速器（HIMAC）设施中进行了辐照实验。针对氩（每核子230、400兆电子伏）、硅（每核子800兆电子伏）、氖（每核子100、230、400兆电子伏）、碳（每核子100、230、400兆电子伏）、氦（每核子100、230兆电子伏）、质子（100、230兆电子伏）离子，获取了厚铜靶中的放射性散裂产物。使用高纯锗（HPGe）探测器测量了插入复合铜靶中的辐照铜样品的伽马射线能谱。从伽马射线能谱中，我们得到了铜靶中铜样品内40种核素散裂产物放射性产额的空间分布。根据放射性产额的空间分布，我们估算了铜靶中产生的剩余活度和光子剂量。对于相同的每核子入射能量，剩余活度和光子剂量随着每核子入射能量的增加以及入射粒子束的射程而增大。
