氟化锂探测器测量质子时厚度效应的分析

An Analysis on Thickness Effect of Lithium Fluoride Detector in Proton Measurement.

目的分析氟化锂（ＬｉＦ） 探测器在测量质子时的厚度效应。方法在比较理想与合理的假设下，利用探测器吸收剂量的定义推导计算。结果质子能穿透探测器时，探测器厚度效应不明显：当质子能量大于１２ ＭｅＶ 时，只是当探测器厚度接近于质子射程时其厚度效应才较为明显，小于１２ ＭｅＶ 时，探测器没有厚度效应；质子不能穿透探测器时，探测器厚度效应较为显著。结论 测量低能质子的剂量时，应选用较薄的ＬｉＦ 探测器，以避免其厚度效应的影响。

Objective To theoretically analyze the thickness effect of a LiF detector for proton measurement. Method Thickness effect of the detector was calculated by using the definition of the detector dose under ideal and reasonable hypothesis. Result The thickness effect of the detector was not obvious,when protons could penetrate the detector:when proton energy was above 12 MeV, the thickness effect was obvious only on condition that the detector thickness approaches proton range, when proton energy was less than 12 MeV, the thickness effect was not obvious. The thickness effect of the detector was obvious,When protons could not penetrate the detector. Conclusion Thin detectors should be used in low energy proton measurements to avoid thickness effect of the detector.