Radiant energy – Calibration or standardization methods
Patent
1989-01-10
1990-03-27
Howell, Janice A.
Radiant energy
Calibration or standardization methods
250253, G01V 500, G01T 1169
Patent
active
049123238
ABSTRACT:
This invention relates to a method for preparing radium-free standard solutions of radon-222-in-water of known concentration for use in the more accurate calibrating of liquid scintillation counters than obtainable by the use of radium-226 as standards for calibration. A radium-free radon-in-water standard of the type contemplated herein is defined as a known volume of deionized water with a known activity of radon gas without the presence of any radium activity. This new method provides for the rapid, accurate and inexpensive analysis of Radon-222 water samples by utilizing standards whose activity is derived from actual instrumental quantitative analysis as opposed to problematical mathematical derivation. Using a glass jar generator apparatus, this method generates with a few days a radium-free radon-222-in-water standard whose concentration is determined by gamma spectroscopy using one sample portion of the standard; and at the same time, using cocktail diluted mixtures of plural sample portions of the same standard to calibrate simultaneously one or several liquid scintillation systems.
REFERENCES:
Hutchinson et al., "The NBS Radon-in-Water Standard Generator" Nucl. Instr. Meth. in Phys., A247 (1986), pp. 385-389.
Bhat Ramachandra K.
Guadagno Janine P.
Hanig Richard
Howell Janice A.
Lane Anthony T.
Lee Milton W.
The United States of America as represented by the Secretary of
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