Packet personal radiation monitor
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 radiatonevents, 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. 2 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 6156320
- Patent Number(s):
- 7176010
- Application Number:
- ON: DE89010109
- Assignee:
- Dept. of Energy
- Patent Classifications (CPCs):
-
A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61K - PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
C - CHEMISTRY C12 - BIOCHEMISTRY C12N - MICROORGANISMS OR ENZYMES
- DOE Contract Number:
- AC05-84OR21400
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 61 RADIATION PROTECTION AND DOSIMETRY; RADIATION MONITORS; DESIGN; GEIGER-MUELLER COUNTERS; INVENTIONS; PORTABLE EQUIPMENT; RADIATION PROTECTION; EQUIPMENT; MEASURING INSTRUMENTS; MONITORS; RADIATION DETECTORS; 440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments; 655000 - Medical Physics
Citation Formats
Phelps, J. E. Packet personal radiation monitor. United States: N. p., 1988.
Web.
Phelps, J. E. Packet personal radiation monitor. United States.
Phelps, J. E. Thu .
"Packet personal radiation monitor". United States. https://www.osti.gov/servlets/purl/6156320.
@article{osti_6156320,
title = {Packet personal radiation monitor},
author = {Phelps, J. E.},
abstractNote = {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 radiatonevents, 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. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 31 00:00:00 EST 1988},
month = {Thu Mar 31 00:00:00 EST 1988}
}