Keywords:Scintillation fiber, Fukushima Daiichi Nuclear Power Station, Rubbles, Recycle, Radioactive concentration
It is necessary to confirm the radioactive concentration of recycling contaminated rubbles which is less than the reference concentration for restricted use in the site of Fukushima Daiichi NPS. In order to develop measurement and evaluation methods in the combination of plastic scintillation fiber and inverse analysis for confirmation survey in the 1F site, we studied the measurement methods and geometrical system. We carried out the radiation measurement for simulated recycling rubbles using sealed radiation sources and analyzed gamma radiation fluxes on the PSF. The measurement result was almost agreed with the analytic result by means of correction of position resolution and detecting efficiency for the gamma-ray energy of the PSF. It suggested that it was possible to estimate the radioactive concentration of recycling rubbles.