1前言在核辐射测量中，对所设计的系统进行测试和校验时，必须将源、探头和被检测系统联接起来进行检验。工作时经常和辐射源接触，这些源受环境的影响很大，在大剂量时对人体有较大危害，运输、使用都不太方便，放射源的强度也不好调节。如果用能够模拟辐射源的特性并且能进行 1 Introduction In nuclear radiation measurement, when testing and verifying the designed system, the source, probe and system under test must be connected for testing. Often work and exposure to radiation sources, these sources are greatly affected by the environment, in large doses on the human body have a greater hazard, transport, use are not very convenient, the intensity of radioactive sources are not well regulated. If used to simulate the characteristics of the radiation source and can proceed