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  • 28 March 1999 Volume 8 Issue 1
      

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  • Bo Lindell, H John Dunster, Jack Valentin
    1999, 8(1): 1-8.
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    This report briefly reviews the history, mode of operation, concepts, and current policies of the International Commission on Radiological Protection (ICRP). It touches upon the objectives of the Commission's recommendations, the quantities used, the biological basis of the Commission's policy, the quantitative basis for its risk estimates, the structure of the system of protection, some problems of interpretation and application in that system, and the need for stability, consistency, and clarity in the Commission's recommendations.
  • Yang Guoshan, et al
    1999, 8(1): 21-22,25.
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    This paper analysed the source term, types and tracks of exposure for positron emission tomograph (PET)and related cyclotron. The exposure level has been estimated. Based on these analysis and estimation the assessment of radiological protection and shield for the building of a PET center has been given.
  • Zhu Shoupeng, Xiao Dong
    1999, 8(1): 23-25.
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    The present study engages in determining whether low dose irradiation of 153Sm could cut down the responsiveness of cellular survival to subsequent high dose exposure of 153Sm so as to make an inquiry into approach the protective action of adaptive response by second irradiation of 153Sm. Experimental results indicate that for inductive low dose of radionuclide 153Sm 3.7 kBq/ml irradiated beforehand to cells has obvious resistent effect in succession after high dose irradiation of 153Sm 3.7×102kBq/ml was observed. Cells exposed to low dose irradiation of 153Sm become adapted and therefore the subsequent cellular survival rate induced by high dose of 153Sm is sufficiently higher than high dose of 153Sm merely. It is evident that cellular survival adaptive response could be induced by pure low dose irradiation of 153Sm only.