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US 4,904,871 AGranted
Method of determining radioactivity of low energy beta rays
AssigneeJapan Science, Inc.
InventorHiroaki Ishikawa
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Abstract
This invention is a technique to determine radioactivity of low energy beta emitters using liquid scintillator. Corrections for regression equations which represent the relationship between counting efficiency of a standard and counting rate of a sample make it possible to obtain the radioactivity of the low energy beta emitters. It is very difficult for the emitters to be measured with the conventional efficiency tracing technique.
Claims4
A method of determining radioactivity of low energy beta emitters using liquid scintillator, which comprises:
- obtaining counting efficiencies corrected by working a correction factor on counting efficiencies of the standard which are simultaneously obtained from measuring regions defined by lower and upper levels of a pulse height analyzer using a standard whose maximum counting efficiency is equal to or less than 85% in measuring regions to be used;
- obtaining counted values corrected by working a correction factor on counted values of a sample for radioactivity to be measured which are simultaneously obtained in the measuring regions;
- determining a regression equation using the corrected counting efficiencies and the corrected counted values;
- and
- making correction of counted value at counting efficiency 100% of a regression equation by a correction factor obtained by standards.
2 more elements
Dependencies are inferred from the claim text.