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Kume, Kyo*; Otani, Nobuo*
JNC TJ4440 2003-007, 312 Pages, 2004/03
JNC-TJ4440-2003-007.pdf:42.33MB
Environmental neutron detection system is proposed. The main goal of this system was set to detect fast and thermal neutrons with the identical detector setup without degraders. A detector setuup for thermal neutron counting in prebious years, was developed first. Feasible study of this detector system for fast neutron counting was done, with help of Monte Carlo simulation and analysis of experiments with both a neutron source and neutron beam at an accelerator facility. In addition, B doped plastic intillator was studied for measurement of environmental neutrons. This was done through experiments with an Am-Be neutron source, with help of Monte Carlo simulation. In the meantime, possibility of the use of inorganic scintillators in neutron counting was verified, to solve the problems occuring at the long term use of the organic liquid scintillators. The detectors checked were BGO, GSO, and Nal. BGO was shown that it has little possibility for use at neutron measurement, while GSO and Nal were shown that these detectors have trivial sensitivity in neutron measurement.
Maruyama, Tadashi*; Nagatomo, Jinro*
JNC TJ2410 2003-001, 170 Pages, 2003/08
JNC-TJ2410-2003-001.pdf:6.32MB
The results of measurement showed that anomalous breakthrough curves were observed at -180
C which is effect of condensation of noble gas. However, the amomalous breakthrough curves was not observed at -170C. It was shown that the activated good performances. The effect of materials propertied on the absorption and the desorption properties is summarized as follows: The longer breakthrough time and the steeper break through curves were obtained as the grain size became smaller and the specific surface area gets larger. Further studies are needed to elucidate effect on enrichment of experimental conditions by varying such as the heating rate,sweep gas velocity,and the onset tempertuer of heating
Tsujimoto, Tadashi*; Onishi, Teruaki*
JNC TJ4420 99-002, 436 Pages, 1999/03
no abstracts in English
Onishi, Teruaki*; Tsujimoto, Tadashi*
JNC TJ4420 99-001, 544 Pages, 1999/03
no abstracts in English