Thin NaI (TI) scintillation counters were used for the assessment of body burdens in dogs exposed to 23QPu aerosol. Experiments were made with both a dog phantom and live dogs. Although the count rate was affected by changes in dog size and isotopic composition of the plutonium, the limiting factor in the accurate assessment of body burdens in our work was the distribution of the plutonium within the dog. Despite these problems, the body burdens of dogs have been determined with an accuracy of f 10% at 0.1 pCi levels, The average sensitivity obtained when counting the 17 keV X-rays emitted was 2.28 0.16 countsfminlnCi and was 13.3 i 1.1 counts/minfnCi when counting both the X-rays and 60 keV 241Am gamma rays. These sensitivities are based on body burdens determined by post-mortem alpha-counting analysis of the tissues of eight dogs that had previously been counted in the plutonium counter. In this study thirty exposed dogs were counted and body burdens ranging from 0.136 pCi to 3.12 pCi were observed.
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