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Automatic measurements and computations for radiochemical analyses

Analytical Chemistry

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Abstract

In natural radioactive sources the most important radioactive daughter products useful for geochemical studies are protactinium-231, the alpha-emitting thorium isotopes, and the radium isotopes. To resolve the abundances of these thorium and radium isotopes by their characteristic decay and growth patterns, a large number of repeated alpha activity measurements on the two chemically separated elements were made over extended periods of time. Alpha scintillation counting with automatic measurements and sample changing is used to obtain the basic count data. Generation of the required theoretical decay and growth functions, varying with time, and the least squares solution of the overdetermined simultaneous count rate equations are done with a digital computer. Examples of the complex count rate equations which may be solved and results of a natural sample containing four ??-emitting isotopes of thorium are illustrated. These methods facilitate the determination of the radioactive sources on the large scale required for many geochemical investigations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Automatic measurements and computations for radiochemical analyses
Series title:
Analytical Chemistry
Volume
32
Issue:
9
Year Published:
1960
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1093
Last page:
1098
Number of Pages:
6