RADIATION MONITORING SYSTEM

摘要

PURPOSE:To measure the concn. of the atmosphere radioactivity in an atomic power plant accurately and improve the reliability of a radioactivity monitoring system by preventing sticking of suspensible nuclides on a radiation monitor by means of a freely automatically and remotely windable filter. CONSTITUTION:A filter 3 which is made freely windable with a remote winder 6 and is of the thickness at which absorption of the radiations from the radioactivity in the atmosphere is negligible is mounted to the front surface of a monitor 1 of which the circumference is enclosed by a cylindrical cover 2 for shielding or gamma rays. Hence, the suspensible nuclides in the atmosphere do not stick on the monitor 1 and since the monitor is not affected by gamma rays in accordance with the stuck nuclides, the concn. of the atmosphere radioactivity is measured accurately and a radiation monitor system of high reliability is obtained.