| 摘要 |
PURPOSE:To ignore the influence of braking radiation and to improve measurement precision by lining a container where radio-active gas is run and reserved with a material with a low atomic number to thickness larger than the maximum range of beta rays. CONSTITUTION:The tank 1 for radioactive gas measurement is lined 6 with the material with a low atomic number to thickness (range) with which beta rays are cut off to suppress the generation of braking radiation. When the thickness of this lining 6 is less than the range of beta rays, the beta rays reach stainless steel as the material of the tank 1 to generate braking radiation, so the thicker the lining 6, the better so as to cut off the braking radiation. When the thickness is extremely large, on the other hand, the attenuation of gamma rays to be measured themselves become extreme, causing a decrease in precision. Thus, the lining 6 is provided to ignore the influence of braking radiation and also improve the measurement precision.
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