Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1985-02-22
1987-02-17
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250385, 250388, G01T 1185, H01J 4702
Patent
active
046441670
ABSTRACT:
A beta radiation particle detector having a housing that is substantially impervious to beta radiation particles and which surroundingly encompasses an ionization chamber which is defined by electrically conductive walls is disclosed. The walls terminate in an edge which defines an opening into the ionization chamber with the opening being covered by a beta radiation pervious electrically conductive window that entraps, within the ionization chamber, a quantity of gaseous molecules which are adapted to ionize upon impact with a beta radiation particle. An electrode is disposed within the ionization chamber and has a generally shallow concave surface having a width which is substantially greater than its depth and which faces the electrically conductive window. The concave surface of the electrode terminates in a generally annular rim that is disposed substantially adjacent to the edge of the walls so that the rim is configured to substantially conform to the electrically conductive walls so as to define a beta radiation sensitive volume generally located within the ionization chamber between the beta radiation pervious electrically conductive window and the concave surface of the electrode. A battery, for establishing an electrical potential between the electrode and the electrically conductive walls and window, is adapted, upon creation of an ion within the beta radiation sensitive volume of the ionization chamber to cause an electric current to flow within a circuit between the walls/window and the electrode. A meter for detecting and measuring the flow of electric current in the circuit and displaying the amount of radiation dose rate present is included.
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Duke Power Company
Hannaher Constantine
Howell Janice A.
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