Effects of the Leakage Magnetic Field from an Analog Meter on the Response of Scintillation Survey Meters
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概要
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Effects of the weak leakage magnetic field are studied on the response of two kinds of scintillation survey meters: an ordinary type for γ-rays and that optimized for the detection of low-energy photons from <SUP>125</SUP>I.In the presence of the magnetic field, the response of the optimized survey meter decreases to the photons from <SUP>125</SUP>I, and increases considerably to the background radiations. On the other hand, the response of the ordinary survey meter decreases slightly to both the γ-rays from <SUP>131</SUP>I and the background radiations.From analysis of the pulse-height spectra for the radiations, such variations of the response are ascribed to the reduction of the amplification factor of photomultiplier tubes by the magnetic field.
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