论文标题
$^{252} $ cf裂变中子和D-BE产生的中子辐射的初级和次要颗粒的剂量和次数分布
Dose and Fluence Distributions of the Primary and Secondary Particles in Biological Material Irradiated by $^{252}$Cf Fission Neutrons and d-Be Generated Neutrons
论文作者
论文摘要
为了理解中子的生物学作用，在生物物理模型中需要通过中子照射对二次带电颗粒分布的预测。我们已经使用了由中子束以低于10 MeV的能量照射的，在生物材料中，带电颗粒的剂量和通量光谱的计算机代码进行了详细的蒙特卡洛模拟。我们比较了放射生物学实验中使用的两个不同中子光谱的结果。 $^{252} $ cf的自发裂变中子光谱和4 meV d-be生成的中子谱。结果表明，超过90％的剂量和通量来自次级质子，与小鼠相比，与小鼠的深层组织区相比，表面附近的高能量（<2 meV）和高莱特，并表明表面附近的较高次级电荷颗粒通量。还提出，不同的中子源认为会导致相似类型的二级颗粒，其次要粒子具有适度的变化。
For understanding the biological effects of neutrons, predictions of the secondary charged particle distributions by neutron irradiation are needed in biophysical models. We have performed detailed Monte-Carlo simulations using the PHITS computer code of the the dose and fluence spectra of charged particles in the biological materials irradiated by neutron beams with energies below 10 MeV. We compare the results for two different neutron spectra used in radiobiology experiments; the spontaneous fission neutron spectrum of $^{252}$Cf, and a 4 MeV d-Be generated neutron spectrum. The results show that over 90% of the dose and fluence are from secondary protons, which are low energy (<2 MeV) and high LET, and indicate higher secondary charged particle fluence near the surface compared to the deep tissue regions in a mouse. It is also suggested that the different neutron sources considered result in largely similar types of secondary particles with modestly varying fluence distributions.
