Electret ionization chamber for monitoring radium and dissolved

Details Electret ionization chamber for monitoring radium and dissolved Electret ionization chamber for monitoring radium and dissolved

1989-07-31

1991-10-08

Fields, Carolyn E.

Radiant energy

Geological testing or irradiation

With sampling

250253, 2503361, 250374, 250380, G01T 1185

Patent

active

050556746

ABSTRACT:
An electret ion chamber based radon monitor is employed as a method of measuring radium-226 and dissolved radon-222 concentrations in water. The procedure consists of taking a known volume of water and placing it in a container of known volume and determining the equilibrium radon concentration in the air phase above the water using an electret ion chamber radon. The radon concentration in the original water sample is calculated from the radon concentration of the air phase. A detailed theory is proposed and experimental results reported. Given a 200 ml water sample, it is typically possible to measure radon concentration of 160 pCi/l with an accuracy of 10% in a one day measurement. One pCi/l of Ra-226 can be also determined with an accuracy of 10% over a 10 day period.

REFERENCES:
patent: 4227086 (1980-10-01), Dreyfus et al.

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