2004 Fiscal Year Final Research Report Summary
Photostimulable phosphors for neutron imaging
| Project/Area Number |
14350044
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Japan Atomic Energy Research Institute |
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Principal Investigator |
SAKASAI Kaoru Japan Atomic Energy Research Institute, Neutron Science Research Center, Senior Engineer, 中性子利用研究センター, 副主任研究員 (00343913)
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| Co-Investigator(Kenkyū-buntansha) |
KATAGIRI M. Japan Atomic Energy Research Institute, Neutron Science Research Center, Principal Engineer, 中性子利用研究センター, 主任研究員 (90354886)
MATSUBAYASHI M. Japan Atomic Energy Research Institute, Neutron Science Research Center, Senior Engineer, 中性子利用研究センター, 副主任研究員 (50354767)
NAKAMURA T. Japan Atomic Energy Research Institute, Neutron Science Research Center, Research Engineer, 中性子利用研究センター, 研究員 (60354768)
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| Project Period (FY) |
2002 – 2004
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| Keywords | neutron imaging plate / photostimulable phosphor / gamma-ray sensitivity / neutron sensitivity / SrBPO_5:Eu / SrBPO_5:Ce / CaBPO_5:Ce / detective quantum efficiency |
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| Research Abstract |
As new photostimulable phosphors with low gamma-ray sensitivities, SrBPO5:Eu, SrBPO5:Ce, and CaBPO5:Ce based phosphors have been prepared and their photostimulated luminescence (PSL) characteristics by neutron irradiation were investigated. The PSL peak of SrBPO5:Eu was about 390 nm due to 5d-4f transition of Eu^<2+>. The PSL intensity was linearly dependent on E^<-1/2>, where E is neutron energy. The S_γ/S_n ratio of SrBPO_5:Eu phosphor was one order magnitudes lower than that of commercially available neutron imaging plates (NIPs), where S_n and S_γ are neutron and gamma-ray sensitivities, respectively. A collimated neutron beam image was obtained with a spatial resolution of 0.4 mm. The PSL characteristics of SrBPO5:Ce and CaBPO5:Ce were almost the same as those of SrBPO5:Eu. The peak and lifetime of PSL of these phosphors was 340nm and 23.5 ns, respectively. Moreover, the PSL intensity was significantly increased by introducing fluorine atoms. The detective quantum efficiency (DQE) of SrBPO5:Eu and CaBPO5:Ce can be more than 40 %, while that of commercially NIPS was less than 40%. Since the PSL peak of SrBPO5:Eu was the same as that of commercially NIPs, new NIPs made of SrBPO5:Eu was made and the image of imaging subjects was clearly obtained by using a conventional reader. The spatial resolution was 0.3 mm and the gamma-ray discrimination ability was better than that of commercially NIPs.
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