Development and test of radioactive plume simulator

The response to small dose rate variation is one of important performance for environmental γ radiation monitor. In this paper we presented a radioactive plume simulator that home made and the test result for its radiation field dose rate. The components of this device include radiation source and its transport system, source shielding, lead attenuator, controller. The air Kerma rate at 3 m from the radiation source and 1 m above ground was obtained by MC simulation and G(E) function method, and the difference between two method is within 5%. This device can provide the radiation field over the range of 10∼50 nGy/h, used to testing the performance of response to small dose rate variation for environmental γ radiation monitor. (authors)