Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1988-03-31
1989-08-15
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250374, 250387, G01T 118
Patent
active
048577391
ABSTRACT:
A personal radiation monitor of the chirper type is provided for detecting ionizing radiation. A battery powered high voltage power supply is used to generate and apply a high voltage bias to a G-M tube radiation sensor. The high voltage is monitored by a low-loss sensing network which generates a feedback signal to control the high voltage power supply such that the high voltage bias is recharged to +500 VDC when the current pulses of the sensor, generated by the detection of ionizing radiation events, discharges the high voltage bias to +450 VDC. During the high voltage recharge period an audio transducer is activated to produce an audible "chirp". The rate of the "chirps" is controlled by the rate at which the high voltage bias is recharged, which is proportional to the radiation field intensity to which the sensor is exposed. The chirp rate sensitivity is set to be approximately 1.5 (chirps/min/MR/hr.). The G-M tube sensor is used in a current sensing mode so that the device does not paralyze in a high radiation field.
REFERENCES:
patent: 3715593 (1973-02-01), McGunigle
patent: 3984690 (1976-10-01), Marshall, III et al.
patent: 4191886 (1980-03-01), Basso et al.
patent: 4588892 (1986-05-01), Kopp
patent: 4596933 (1986-06-01), Waechter et al.
patent: 4617680 (1986-10-01), Johnston
patent: 4721857 (1988-01-01), Kronenberg
patent: 4772793 (1988-09-01), Larson et al.
Breeden David E.
Hamel Stephen D.
Hightower Judson R.
Howell Janice A.
Rauchholz William F.
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