Electret ion chamber for radon monitoring
AssigneeRad Elec Inc.
InventorsRobert W. Ramsey, Jr., Payasada Kotrappa
Life of this patent
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Abstract
An electret ion chamber for monitoring radon comprises a housing having an electret holder and a cover. The cover is attached to a plunger which closes over the electret when the cover is in place and is removed from the electret when the cover is opened. The plunger effectively turns "on" and "off" the radon monitor with the opening and closing of the cap. In very short term and very long term radon monitors, this turn on and off feature is not needed.
Claims18
A housing for an electret ion chamber radon monitor comprising:
- a chamber formed of electrically conductive plastic having an open bottom and a narrowed neck;
- electret means forming the bottom of the chamber containing an electret electrostatically charged to attract radioactive decay ions;
- a cap attachable to the narrowed neck of the chamber, the cap having a vent hole for gas equalization of the chamber to the outside;
- a keeper means attached to the cap so that when the cap is closed the keeper covers the electret and when the cap is opened the keeper is removed from the electret;
- and
- whereby opening and closing of the cap effectively turns on and off the radon monitor.
The housing of claim wherein the keeper means is a plunger rigidly attached to the cap;
- and wherein the cap is urged to an open position by a spring.
A housing for an electret ion chamber radon monitor comprising:
- a generally spherical shaped chamber formed of an electrically conductive plastic having an open base region;
- electret means adapted for mating with the base region, the electret means containing an electret electrostatically charged to attract radioactive decay ions;
- and
- inlet holes around the periphery of the base to allow exchange of ambient air by diffusion into the chamber.
A housing for an electret ion chamber radon monitor comprising:
- a generally hemispherical shaped chamber formed of an electrically conductive plastics having an open base region;
- electret means adapted for mating with the base region, the electret means containing an electret electrostatically charged to attract radioactive decay ions;
- and
- an inlet hole located around the periphery of the hemispherical shaped chamber to allow exchange of ambient air by diffusion into the chamber.
Dependencies are inferred from the claim text.