| 摘要 |
PROBLEM TO BE SOLVED: To continuously and highly accurately measure the concentration of a radioactive nuclide by making the radioactive nuclide absorbed into a plastic scintillator and emit light by leaving the plastic scintillator in a liquid or a gas. SOLUTION: A fluorescent substance PPO is dispersed in a plastic scintillator 1, and the scintillator 1 is brought into contact with the liquid or the gas. the radioactive nuclide Rn in the liquid or the gas is made to be absorbed in the plastic scintillator 1 by the contact. The fluorescent substance PPO is caused to emit light by radiation 2 emitted by the radioactive nuclide Rn in the plastic scintillator 1. Light 3 emitted by the nuclide Rn and transmitted through a surface 4 of the plastic scintillator 1 by the light emission is detected by an optical sensor 5 arranged opposed to the surface 4 in the method for measuring the concentration of the radioactive nuclide in the liquid or the gas. COPYRIGHT: (C)2004,JPO
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