Development of portable memory type radiation alarm monitor

A radiation alarm monitor has been developed and manufactured in order to protect radiation workers from over-exposure. A visual and audible alarm system has been attached to initiate evacuation when accident occurs such as an unexpected change of radiation level or an over-exposure. The radiation alarm monitor installed with microprocessor can record the information of radiation field change between 90 min. before the alarm and 30 min. after the alarm and also provide the data to an IBM compatible computer to analyze the accidents and to set a counter plan. It features a wide detection range of radiation field(10 mR/h-100 R/h), radiation field data storage, portability, high precision (±5%) due to self-calibration function, and adaption of a powerful alarm system. According to ANSI N42.17A, the most stringent test standards, performance tests were carried out under various conditions of temperature, humidity, vibration, and electromagnetic wave hindrance at Korea Research Institute of Standards and Science(KRISS). As a result, the Radiation Alarm Monitor passed all tests