ANALYSIS OF CS134-CS137 MIXTURES BY GAMMA -RAY SPECTROMETRIC METHODS,
Abstract
Cs134-Cs137 mixtures were analyzed by gamma-gamma coincidence spectrometry and by least-squares analysis of non-coincident gamma-ray pulse-height spectra. The sensitivity and accuracy of the two methods were evaluated and compared. Particular attention was paid to mixtures with low Cs134 content. Known mixtures of Cs134 and Cs137, whose Cs134/Cs137 count-rate ratios ranged from 0.002 to 8, were prepared and analyzed by both methods. The accuracy and precision of the coincidence measurements for mixtures with count-rate ratios between 0.01 and 0.002 were 5% or better, and for ratios higher than 0.01 they were 1%. The gamma-gamma coincidence method proved to be far more sensitive than the least-squares analysis of non-coincident gamma-ray spectra. In the latter case, Cs134 could not be detected in mixtures with ratios below 0.01. However, the leastsquares method was found to be more sensitive than other non-coincident gamma-ray spectrometric methods. It could be used to analyze mixtures with Cs134-Cs137 ratios down to 0.01, although precision is poor at the lower range. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 09, 1966
- Accession Number
- AD0630302
Entities
People
- Sachio Yamamoto
Organizations
- Naval Radiological Defense Laboratory