Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1984-12-19
1986-12-23
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250375, 250386, G01T 118
Patent
active
046314113
ABSTRACT:
The invention substantially eliminates measurement errors in radiation field strength due to circuit propagation time delays and slow drift conditions, Geiger-Mueller tube turn-on time and response curve variations, and the need to manually calibrate the measurement apparatus in high radiation fields to compensate for time errors. The exponential probability function has the property that the expected value for the arithmetic mean of any right hand segment of the curve is always the same provided that the axis is adjusted so that the starting point of the selected segment is zero. The curve is trimmed dynamically each time a new rate is calculated. An individual count of strike events is kept for N separate but consecutive time units, and the counts for the later occurring events are lumped together as the Main Event. After the data collection period ends, a total accumulated time and accumulated count are constructed. This construction begins by examining the Main Event data. If enough data is present to derive a statistically acceptable estimate (250-500 events) the data in the first N time units is ignored. If more data is desirable, the data is factored in, one time unit at a time starting backward from the event count corresponding to time unit with the longest time. The total time is now adjusted so that the starting time corresponding to the selected portion of the PDF is zero. An estimate for rate is made by dividing the total adjusted number of counts by the total adjusted accumulated time and multiplying by a scale factor.
REFERENCES:
patent: 2858448 (1958-10-01), Brown et al.
patent: 4260892 (1981-04-01), Kovacs et al.
patent: 4453076 (1984-06-01), Jackson et al.
Hanig Richard
Nuclear Research Corp.
Smith Alfred E.
Udell Walter B.
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