제안 방법

• A CZT with a volume of 1x1x0.5 cm3 was selected to be an optimized sensor to achieve the information on the dose rate and the radioactivity due to the contaminants, such as 131I, 134Cs, and 137Cs in a nuclear accident response.
• In this study, a hand-held CZT detector was developed using a CZT sensor with a volume of 0.5 cm3 (CZT500S, GBS Elektronik GmbH, Groberkmannsdorf, Germany), and making up the signal processing circuits with an on-board type.
• To determine the source and its amount of contaminants and divide the contaminated areas in the response of the nuclear accident, the information on the ambient dose rate in the scene of the accident and the radioactivity of the contaminants should be quickly, efficiently, and accurately corrected by mobilizing possible methods. In this study, for the above purpose, the hand-held CZT detector was developed to make the in-situ gamma-ray spectrometry and its performance was checked to have a good energy resolution. In addition,the collimator and the airborne dust sampler were developed and mounted to the developed CZT detector for a quick and efficient response to a nuclear accident.
• 7. Since the energy resolution was well defined until the photon energy of about 1.0 MeV, the developed CZT detector was sufficient to apply to the in-situ measurement of ¹³¹I, ¹³⁴Cs, and ¹³⁷Cs in the nuclear accident response.
• The system control unit was designed to operate the CZT detector, monitor the detector, battery, and interface status, and check the measured results of the dose rate and radioactivity. In the system control part, as shown in Fig.