DESIGN AND CONSTRUCTION OF AN EARLY WARNING ENVIRONMENTAL RADIATION MONITORING STATION

DANG QUANG THIEU1, TRAN NGOC TOAN1, NGUYEN THI BAO MY1, NGUYEN VAN SY1, VU VAN TIEN1, NGUYEN THI THUY MAI1, LE DINH CUONG1
1 Institute for Nuclear Science and Technology, VINATOM

Main Article Content

Abstract

Early Warning Environmental Radiation Monitoring Station, used ONLINE environmental radiation monitoring and early warning network, has high sensitive radiation detection and it can send the alarm signal quickly by the internet network to the emergency management office. Its gamma probes are one NaI(Tl) detector and three GM detectors. The NaI(TL) detector is used to monitor spectrum environmental radiation and identify the isotopes, the other are used to detect high dose rate of gamma rays. This instrument must tolerate a wide range of ambient temperature and strong temperature slopes when used in outdoor. However, the gain of photomultiplier tube, amplifier and ADC must be stabilized by pulsed LEDs used as precision reference light sources.

Article Details

References

[1] H.L. Beck, W.J. Condon, and W.M. Lowder, Spectrometric Techniques for Measuring Environmental Gamma radiation, USAEC Report HASL-150, October (1964).
[2] T. Nagaoka, Intercomparision between EML method and Jaeri method for the measurement of Environmental gamma ray exposure rates, Radiat. Prot. Dosimetry, 18 (1987) 81.
[3] G. Cho, H. K. Kim, H.Woo, G.Oh and D.K. Ha, Electronic dose conversion technique using a NaI(TL) detector for assessment of exposure dose rate from environmental radiation, IEEE Transaction on Nuclear Science, 45 (1998) 981.
[4] G. Fehrenbacher, Method for the Spectrometric photon Dosimetry for X-ray and gamma radiation. Patent Application Publication, Pub. No: US2009/0127468A1, Pub. Date: May 21, 2009.
[5] Takao Tojo, A method of exposure-dose rate measurement with a NaI(TL) crystal, Nucl. Instrum. Meth., 205 (1983) 517.
[6] S.A. Philips, F.Bronson, R. Venkataraman and B.M. Young, ISOCS Characterization of Sodium Iodide Detector for Gamma–ray Spectrometry. Nuclear Science Symposium Conference Record, 1, 2004, 211
[7] K. Saito and S. Moriuchi, Monte Carlo calculation of NaI(TL) detector response Functions for low energy Gamma-ray. Nucl. Inst. Meth., 226, 1984, 449.
[8] M. Tsutsumi, K.Saito and S. Moriuchi, Development of a detector for measuring Effective Dose (Equivalent) for External photon Exposures in Natural Environment. J Nucl Sci Technol., 37, 2000, 300.
[9] D.A. Rasolonjatovo, H. Suzuki, N. Hirabayashi, T. Nunomiya,T. Nakamura and N. Nakao, Measurement for the Dose – rate of the Cosmic – ray Component on the Ground, J. Radiate. Res., 43, 2002, S27-33.
[10] C.Holzheimer and S.Hartmann, SARA (Spectroscopic Ambient Radiation Detection) Spectroscopic Monitoring Systems for online Environmental Radiation Monitoring Edition 2008, Proceeding of IX Radiation Physics & Protection Conference, 15-19 November 2008, Nasr City- Cairo, Egypt.
[11] Inspector 1000, Digital Hand-held MCA, User’s Manual.
[12] LB 125 - Analyzer version 1.47, Berthold Operating Manual.