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A direct reading X-ray dosage-rate meter is described, which consists of a radiation transparent thimble ionization chamber (volume ½ c.c.), connected by a thin flexible cable to a negative feed-back D.C. amplifier. The instrument is robust and cheap to manufacture. An accuracy of better than ± 5 per cent. or 1 r/min. is achieved on all ranges, and the instrument is intended for routine measurements in a radiotherapy department. Standard radio components are used throughout and electrometer valves have been eliminated. The instrument is adaptable for radium dosage-rate measurements, stray radiation measurements, and as a radon balance.
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Robin Herbert (1948) studied this question.
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