The behaviour of Geiger tubes at elevated temperatures

By: Belin, R.E.
Contributor(s): DSIR, Dominion Physical Laboratory. Lower Hutt.
Material type: materialTypeLabelBookPublisher: 1955 14 SepDescription: 12 p.Report number: DPL-R--252; INS-Contrib--11Subject(s): GEIGER COUNTERS | HIGH TEMPERATURE | TESTS | ARGON | COPPER | CATHODES | RADIOACTIVITY | EXPLORATION | GEOTHERMAL ENERGY | THERMAL WATERS | BOREHOLES | GAMMA RAYS | WELL LOGGING | ALCOHOLS | ETHYL FORMATE | RN=109-94-4
Incomplete contents:
By varying the ratio of argon to alcohol and the total filling pressure of a Geiger tube, an optimum filling of 1 cm of H/sub g/ of alcohol plus 10 cm of H/sub g/ of argon was deduced. Several tubes with this filling, and also with ethyl formate replacing the alcohol were subjected to temperatures up to 150 deg. C. An initial high background counting rate and a permanent upward shift in threshold voltage of between 10 to 50V were observed. The counting rate returned to normal background according to an inverse time relationship. Subsequent temperature increases showed no change in count rate and normally only about 5 volts increase in threshold voltage at 100 deg. C. On reducing the temperature again to ambient the threshold would return to normal, i.e. drop 5 volts. Tentative suggestions for this threshold change are advanced. Both the plateau and plateau slope are improved with increase in temperature
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1 ref; 6 figs

By varying the ratio of argon to alcohol and the total filling pressure of a Geiger tube, an optimum filling of 1 cm of H/sub g/ of alcohol plus 10 cm of H/sub g/ of argon was deduced. Several tubes with this filling, and also with ethyl formate replacing the alcohol were subjected to temperatures up to 150 deg. C. An initial high background counting rate and a permanent upward shift in threshold voltage of between 10 to 50V were observed. The counting rate returned to normal background according to an inverse time relationship. Subsequent temperature increases showed no change in count rate and normally only about 5 volts increase in threshold voltage at 100 deg. C. On reducing the temperature again to ambient the threshold would return to normal, i.e. drop 5 volts. Tentative suggestions for this threshold change are advanced. Both the plateau and plateau slope are improved with increase in temperature

NS

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