DETERMINATION OF VERY-LOW LEVELS OF RADIOACTIVITY - (TECHNICAL REPORT)

This evaluation of techniques, apparatus, and dedicated facilities for measurement of very low levels of radioactivity is addressed to the l arge community of researchers who use radioactive tracers, make activa tion analyses, etc, and may occasionally face the problem of measuring an activity well below the level accessible with standard commercial equipment. Emphasis is put on the instrumental gamma-spectrometric ass ay of complex mixtures of radionuclides, on the spectrometric measurem ents of alpha activities in relatively massive samples, and on countin g spontaneous fission events in samples of large mass and/or volume. A list of institutions and agencies which are active in developing low- level counting methods is given.