Greene D, Major D, Redpath T
Phys Med Biol. 1975 Mar;20(2):244-54. doi: 10.1088/0031-9155/20/2/006.
The dose given to a polythene energy absorber in the radiation field from a 14 MeV neutron generator has been measured calorimetrically. The calorimeter was calibrated by giving the energy absorber a known dose of gamma-rays. The dose measured in this way was compared with that determined with a polythene-ethylene ionization chamber, and the two results agreed to better than 1%, though the estimated uncertainties on the calorimeter and ionization chamber results were each about 4%. This result can be used to determine a value of the ratio Wn/We, for 14 MeV neutrons in ethylene, where Wn is the W value for the charged particles generated in the neutron field in ethylene, and We is the W value for electrons in the same gas. The measured value of Wn/We was found to be 1.07 plus or minus 3.9%. The significance of the 'thermal defect' in polythene is discussed.
已用量热法测量了14兆电子伏中子发生器辐射场中聚乙烯能量吸收体所吸收的剂量。通过给能量吸收体已知剂量的γ射线来校准量热计。将以这种方式测得的剂量与用聚乙烯 - 乙烯电离室测定的剂量进行比较，尽管量热计和电离室结果的估计不确定度均约为4%，但二者结果的一致性优于1%。该结果可用于确定乙烯中14兆电子伏中子的Wn/We比值，其中Wn是乙烯中子场中产生的带电粒子的W值，We是同一气体中电子的W值。发现Wn/We的测量值为1.07±3.9%。讨论了聚乙烯中“热缺陷”的意义。
