USE OF A GAMMAVISOR AS AN AUTOMATICALLY CONTROLLED SYSTEM FOR ACQUIRING IMAGES OF RADIOACTIVE OBJECTS

An automatically controlled system for remote visualization of radioac tive objects, called a gammavisor, is described. It consists of a pin- hole chamber with an aperture of O 1.5 mm, a CsI(TI) scintillator 40-m m in diameter and 3-mm thick, an image converter with a gain of 100 an d five-fold image reduction, and a CCD-matrix (charge-coupled device m atrix). The system can be remotely controlled by an operator using a p ersonal computer that is connected to the on-board computer of the who le system by a 200-m cable. The angle of vision equals 20 degrees, the angular resolution is 1 degrees, the sensitivity to a Cs-137 point ga mma-source is 4.4 MBq at a distance of 1 m and a data acquisition time of 1 h. Some examples of applying a gammavisor to exploration of cont aminated equipment in nuclear reactors are presented.