RADIONUCLIDES IN RICE IN HONG KONG

RADIONUCLIDES IN RICE IN HONG KONG K. N. Yu 1 first-author S. Y. Mao 1 Department of Physics and Materials Science, City Polytechnic of Hong Kong Department of Physics and Materials Science, City Polytechnic of Hong Kong Radionuclide contents in imported rice are determined using the EG & G OR-TEC photon spectrometer system. Most of the natural radionuclides are found to have specific activities below the detectable limit. 40 K has values ranging from 0.104 to 32.97 Bq/kg; 137 Cs from 0.009 to 0.52 Bq/kg; and 95 Zr less than 0.077 Bq/kg. The annual effective dose for a male and a female adult is 18 µ Sv and 12.7 µ Sv, respectively. Both are less than the value recommended by the International Commission of Radiological Protection. Photon spectrometer system Rice 40 K 137 Cs 95 Zr Weighted committed dose equivalent REFERENCES Man C K , Lau S Y , Chan P et al . Journal of Environental Radioactivity , 1992 ; 16 : 255 - 260 Journal of Environental Radioactivity Hong Kong Census and Trade Statistics Department . Hong Kong Trade Statistics Imports, Exports/Reexports (Dec., 1990) . Hong Kong : Government Printer , 1990 Hong Kong Trade Statistics Imports, Exports/Reexports (Dec., 1990) ICRP . Publication 23, Report of the task group on reference man . Oxford : Pergamon Press , 1975 Publication 23, Report of the task group on reference man ICRP . Publication 30, Limits for intakes of radionuclides by workers . Oxford : Pergamon Press , 1980 Publication 30, Limits for intakes of radionuclides by workers ICRP . Publication 38, Radionuclides transformations: energy and intensity of emission . Oxford : Pergamon Press , 1983 Publication 38, Radionuclides transformations: energy and intensity of emission Hong Kong Census and Trade Statistics Department . Hong Kong annual digest of statistics , 1991 edition. Hong Kong : Government Printer , 1991 Hong Kong annual digest of statistics ICRP . Publication 60, Recommendations of the International Commission on Radiological Protection . Oxford : Pergamon Press , 1991 Publication 60, Recommendations of the International Commission on Radiological Protection 1993-11-25 1994-08-01 2021-02-05 1994 Nuclear Science and Techniques 3 5