Radiant energy – Inspection of solids or liquids by charged particles – Including a radioactive source
Patent
1977-05-10
1979-05-22
Smith, Alfred E.
Radiant energy
Inspection of solids or liquids by charged particles
Including a radioactive source
250362, 250369, G01N 2300, G01T 120
Patent
active
041561392
ABSTRACT:
A method and an instrument are, herein, disclosed for measuring the absorbed dose rate of beta-rays in sites of the human body. The instrument of this invention consists of a filter, a thin scintillator, a photomultiplier tube, a linear amplifier, a discriminator having a plurality of pulse height selection potentiometers for selectively taking in only pulses of pulse heights above specified upper limit of pulse height discrimination, a shaper for shaping the selected pulses, and a dose rate indicator for counting the shaped pulses.
The method and the apparatus of this invention are characterized by making the relationship between the counting rate per fluence rate and the maximum energy of beta-ray equal to the relationship between the absorbed dose rate per fluence rate and the maximum energy of beta-ray, and therefore, the absorbed dose rate can be measured independent of the energy of beta-ray.
REFERENCES:
patent: 3646347 (1972-02-01), Farmer et al.
patent: 3892971 (1975-07-01), Arthur et al.
Bingo Kazuyoshi
Chida Toru
Howell Janice A.
Japan Atomic Energy Research Institute
Smith Alfred E.
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