Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1995-06-06
1996-07-30
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
2502521, 2503361, 250375, G01T 1167, G01T 1185
Patent
active
055414150
ABSTRACT:
An apparatus for detecting the area and concentration of radioactive contamination on surfaces, objects and personnel is disclosed. The apparatus is capable of automatic adjustment without intervention by an operator, providing for self-calibration and avoiding the need for periodic calibration, source checking and maintenance by personnel. The apparatus is comprised of one or more position sensitive proportional counters coupled together to act as a single counter. A computer based acquisition system is used to collect the time, energy and position of an ionization event that is caused by the contamination. Collimated radiation sources are located inside of each position sensitive proportional counter. These sources act as stable artifacts in the position and energy spectra that the device acquires as a function of time. The computer continuously adjusts parameters such as detector high voltage, amplifier gain and discrimination to keep the count rate, energy and position that the system measures for these check sources constant. This also corrects for drift and other variations that would cause the system to become misaligned. The apparatus has been built into conveyor systems for monitoring laundry and into portal monitors that are used to monitor workers exiting an area that is contaminated with radioactivity. It has also been used with wheels as a floor monitor and as a stand alone counter for direct monitoring of contamination.
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Papers Prepared by Joseph J. Shonka And his Representatives And Distributed Prior to Sep. 1, 1992.
Fields Carolyn E.
Glick Edward J.
Isaf, P.C. Louis T.
Shonka Research Associates, Inc.
Witherspoon James A.
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