26兆电子伏、35兆电子伏和45兆电子伏质子-铍和质子-锂中子束的剂量测定

Dosimetry measurements of 26, 35 and 45 MeV p-Be and p-Li neutron beams.

作者信息

Quam W M, Johnsen S W, Hendry G O, Tom J L, Heintz P H, Theus R B

出版信息

Phys Med Biol. 1978 Jan;23(1):47-54. doi: 10.1088/0031-9155/23/1/004.

Abstract

Dosimetric properties of neutron beams produced by stopping 26, 35 and 45 MeV protons in beryllium and lithium have been measured. The effects of filtering the p-Be beam with 6 cm of polyethylene have been investigated. The tissue kerma rate in air exhibited an energy dependence of approximately E3 and the rate for p-Be beams was approximately one-fifth of the rate for d-Be beams. The penetrability of the neutrons was significnatly enhanced by the use of the filter, but with a 50% attentuation in tissue kerma rate. The tissue kerma rate for the p-Li beam was nearly the same as that for the p-Be beam.

摘要

已测量了26、35和45兆电子伏质子在铍和锂中停止时产生的中子束的剂量学特性。研究了用6厘米厚的聚乙烯过滤质子-铍束的效果。空气中的组织比释动能率表现出约为E³的能量依赖性，质子-铍束的比释动能率约为氘-铍束的五分之一。使用滤波器显著提高了中子的穿透性，但组织比释动能率降低了50%。质子-锂束的组织比释动能率与质子-铍束几乎相同。