Environmental Radiation Surveillance and Area Monitoring System of Accelerators

We have built four stations of environmental radiation surveillance of gamma and neutron to monitor the leaked radiations and the exhaust airborne radiot · . t 1) ac lVl y arolmd HIRFL. The loe;ic diaGram 9f the HIRFL' s four stations is shown in Fig.1. Every station consists of an~ detector, whioh has been made by using a counter tube composed of BF3 with mcderator of polyethylene containing boron, a gamma detector made by using a cylinder ionization chamber filled with argon, and a simple-plate computer which has been used as a data-collector to read the data from the counter to registers once ten minutes. The data in the registers will be sent to a central microcomputer once a week, in which they will be printed out