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licate measurements were made on another sample of the standard alloy. A mean of 78.5 ± 0.7% was obtained.General Evaluation. This nondestructive method of analysis gives results accurate to within at least 5 to 6% for all three techniques. The sample size was limited to about 2 to 3 grams in the gross-decay and manualsweep-spectrometer methods, but could be increased to about 6 grams in the automatic scan technique. Because the precision of the measurement is a direct function of the total number of counts accumulated, it is advantageous to use the maximum sample size for analysis.Of the two typical spectrometer assemblies, the automatic recording instrument has better resolving power (about 10%, since a well crystal was not used), shorter scan time, and has the additional advantage of automatic recording and measurement, but it