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Title: 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 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.

Inventors:
 [1]
  1. Knoxville, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
867075
Patent Number(s):
4857739
Assignee:
United States Department of Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01T - MEASUREMENT OF NUCLEAR OR X-RADIATION
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
packet; personal; radiation; monitor; chirper; type; provided; detecting; ionizing; battery; powered; voltage; power; supply; generate; apply; bias; g-m; tube; sensor; monitored; low-loss; sensing; network; generates; feedback; signal; control; recharged; 500; vdc; current; pulses; generated; detection; events; discharges; 450; recharge; period; audio; transducer; activated; produce; audible; chirp; rate; chirps; controlled; proportional; field; intensity; exposed; sensitivity; set; approximately; mode; device; paralyze; radiation sensor; voltage bias; voltage power; feedback signal; battery power; radiation events; current pulse; power supply; ionizing radiation; field intensity; current sensing; current pulses; radiation monitor; radiation field; personal radiation; g-m tube; battery powered; radiation event; detecting ionizing; /250/

Citation Formats

Phelps, James E. Packet personal radiation monitor. United States: N. p., 1989. Web.
Phelps, James E. Packet personal radiation monitor. United States.
Phelps, James E. Sun . "Packet personal radiation monitor". United States. https://www.osti.gov/servlets/purl/867075.
@article{osti_867075,
title = {Packet personal radiation monitor},
author = {Phelps, James 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 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}