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:Eu
material as a neutron storage phosphorSakasai, Kaoru; Katagiri, Masaki; To, Kentaro; Takahashi, Hiroyuki*; Nakazawa, Masaharu*; Kondo, Yasuhiro*
2002 IEEE Nuclear Science Symposium Conference Record, Vol.1, p.455 - 459, 2002/00
Characteristics of a SrBPO:Eu material have been investigated as a neutron storage phosphor. The authors found this phosphor shows photostimulated luminescence by illumination with 635 nm laser light after neutron irradiation. The neutron sensitivity was proportional to E
, where E is neutron energy. The S
/S
ratio of the phosphor using enriched boron was better than that of a commercially available imaging plate, where S/ and S are the gamma and neutron sensitivities, respectively. A collimated neutron beam image was clearly obtained with the phosphor sample by scanning focused laser light on it.
Sakasai, Kaoru; Katagiri, Masaki
2002 IEEE Nuclear Science Symposium Conference Record, Vol.1, p.397 - 400, 2002/00
In-situ radiation monitoring in the outside region of a reactor core has been experimentally demonstrated using radiation-resistant optical fibers with scintillators. To avoid influences of luminescence (400-450 nm) from the fibers by radiation, Y
AlO
:Ce scintillators were adopted because the luminescence has its peak around 550 nm. In this method, low radiation field was monitored with a pulse counting method while high field with an integral method. The demonstration experiments shows that radiation intensity outside a reactor core can be well monitored with the system from the reactor power of 1 kW to 3.5 MW. The vertical radiation intensity distribution around the reactor core was also measured at 3.5 MW.
