Gamma radiation levels in the ambient environment of the QNPP Base

Monitoring results of gamma dose rate level in 1992~2004 in the ambient environment of the Qinshan Nuclear Power Plants (QNPP) Base, the northeast of Zhejiang Province, are reported in this paper. It is shown that the gamma dose rate of five monitoring sites of 2.5 km to QNPP Base is 84~113 nGy/h, with an average of 96 nGy/h in the 13 years. The average value is close to the background level of 93 nGy/h prior to operation of the QNPP Base, and is lower than the monitoring result of 101 nGy/h at the reference site in Hangzhou City. Within 50 km from the QNPP Base, the cumulative dose rate of the thermoluminescent dosimeter (TLD) is 90 nGy/h, which is lower than the background level of 111 nGy/h.