Contamination and irradiation measuring method and a universal sensor for implementing said method
OwnerBruno F. Gonthierinventor
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Abstract
A method is provided for contamination and irradiation measurement and a universal sensor for implementing said process. The individual portable sensor of the invention includes an electret a first face of which is at least partially in contact with the fluid which it is desired to monitor and electrodes disposed opposite the second face. An electronic circuit measures the field variation of the electret in the zone opposite said electrodes. An aerolic circuit ensures a constant flow of fluid over the electret.
Claims18
A method of measuring the contamination of a fluid having radioactive aerosols in suspension which emit radioactive radiations, said method comprising the following steps:
- i. attracting and trapping the radioactive aerosols with pairs of ions created by said radiations on an electrostatically charged face of an electret, made of dielectric material, by means of the electrostatic field generated by the electret in said fluid, such trapping causing a progressive discharge of the electret depending on the number of ions collected and on an interaction of the radiation emitted by the trapped aerosols with the dielectric material of the electret, and
- ii. measuring this discharge so as to deduce therefrom a useful parameter of said contamination.
A sensor for measuring the contamination of a fluid having radioactive aerosols in suspension which emit radioactive radiations, said sensor comprising an electret having a first face electrostatically charged which is at least partially in contact with said fluid and which generates an electrostatic field in said fluid, so as to attract and to trap the radioactive aerosols, and a second face located opposite to the first face, an electrode facing a zone of said second face and an electronic circuit for measuring the variation of the field of the electret in the said zone.
Dependencies are inferred from the claim text.