Difficulties are encountered in the use of available radioactivity standards for the calibration of instruments, particularly for counting radionuclides found in the environment. These difficulties are caused by (1) inconsistencies among suppliers in reporting sources of error in the activity statement, (2) the failure of the supplier to indicate significant radioactive impurities, ( 3 ) the failure of some suppliers to furnish complete information on the standardization technique and the assumptions concerning decay schemes and equilibrium conditions and (4) lack of convenient suppliers of standardized solutions of many radionuclides of interest. A model format for a radioactivity standard certificate is proposed.
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