| 摘要 |
PURPOSE:To improve measurement sensitivity by decomposing a material which contains radioactive iodine in a heating furnace, etc., and adsorbing the radioactive iodine in its decomposed gas by active carbon or zeolite. CONSTITUTION:A sample 1 is put in a heat-resisting container 2 and placed in a combustion tube 4 inserted into the heating furnace 3. The sample 1 is decomposed by heating to become gaseous, and the gas is admitted into a filter which is made of active carbon or zeolite and put in a filter cartridge 6. Then, the radioactive iodine in the decomposed gas is adsorbed by the filter 7 selectively and decomposed gas passed through the filter 7 is sucked by a vacuum pump 8 and discharged. The filter 7 of the active carbon or zeolite which has adsorbed the radioactive iodine is analyzed by a pulse height analyzing device, so that the quantity of radioactivity is measured speedily down to an extremely small value.
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