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Two meLhod s of usi ng Ll lC 47r-crysLal-sa nd wichscin t illation coullter , ini tiaLed by one of us [I] I fo r t he s tft ndardizatiOIl ofmdioactive sources, h ave bee n described, namely , the "addition" a nd "coin cid ence" methods. The fonner may be u sed where the CO Llnts due to noise ill the multiplier phototubes a re low compared witll the co unts du e to th e radioactive source, whereas the latter method is applied vd-lere the "tru e" co un ts du e to t he so urce a re low compared wi th the n oise co unts and it is desired to r eclll ce the effect of these random noise counts. In the ad dition method the dead-time correc tion is compl etely orthodox, it being neeessary only to allow for the true co un ts lost due to t he total dead t ime arising from a given number of counts in the one ch annel, each cou nt having associated with i t a ga te or dead time T g .

Efficiency of 4p-crystal-scintillation counting: 2. Dead-time and coincidence corrections