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plutonium-241, is only 4 X 10-5, the initial activity of the uranium is significant because of its short half-life of 6.75 days (7).Results for the alpha-gamma method showed a greater variation from the expected americium growth for two reasons. 65 64 103 96 218 214 242 228mended for extending the range to 0.2 ppm. This lower limit represents a count rate of about 100 counts/minute in 250 µg of typical plutonium, and is below the usual background of a gamma counter. Increasing the sensitivity of the method by employing much larger sample size enhances the hazard of spread of contamination during extraction and therefore is not recommended.

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