Eisen Y, Harvey W F, Raju M R
Dose Assessment Section, Los Alamos National Laboratory, New Mexico 87545.
Radiat Res. 1991 Nov;128(2):197-203.
Three small parallel-plate ionization chambers were developed for measuring dose rates, of primarily low-energy alpha particles in the energy range 0.4-3.5 MeV, at a defined cell-Mylar interface. Spectral energy distributions of these alpha particles were also measured at the same position using a specially designed small-area silicon surface barrier detector. Dose rates were derived from the spectral distributions and compared with those derived from the ionization chambers. Different alpha-particle energies were obtained using a 144-MBq 238Pu collimated source and a variety of Mylar moderator foils of different thicknesses. These measurements, extended to mean alpha-particle energies as low as 0.4 MeV, will enable us to correlate radiobiological data with effects of alpha particles terminating in different regions of cell nuclei.
开发了三个小型平行板电离室，用于在特定的细胞-聚酯薄膜界面处测量主要为能量范围在0.4-3.5 MeV的低能α粒子的剂量率。还使用专门设计的小面积硅表面势垒探测器在同一位置测量了这些α粒子的能谱能量分布。剂量率从能谱分布中得出，并与从电离室得出的剂量率进行比较。使用144 MBq的238Pu准直源和各种不同厚度的聚酯薄膜慢化箔获得了不同的α粒子能量。这些测量扩展到平均α粒子能量低至0.4 MeV，将使我们能够将放射生物学数据与终止于细胞核不同区域的α粒子的效应相关联。
