New organic scintillation fiber detector for the measurement of intense pulsed fission neutron  

作　　者：CHEN Liang OUYANG XiaoPing ZHANG ZhongBing LIU JinLiang ZHANG XianPeng 

机构地区：[1]Northwest Institute of Nuclear Technology, Xi＇an 710024, China

出　　处：《Science China(Technological Sciences)》2012年第1期43-47,共5页中国科学（技术科学英文版）

摘　　要：To measure the pulsed neutron of a pulsed fission source, an organic scintillation fiber （OSF） detector with separation structure has been designed. The proposed detector employs UV optical fibers as the light guide, and the sensitive region of the detector is composed of a linear array of OSFs, which are individually connected to the optical fibers. The other end of the light guide is coupled to a photomultiplier tube. The key properties of the device including the energy response, time response, neutron sensitivity, and radiation effect of the optical fiber were studied. The detector has a relatively high n/γ sensitivity ratio, which increases as the diameter of the OSF decreases, and ratios greater than 10 could be achieved when the diameter of the OSF is less than 0.3 nun. The sensitivity of the detector to neutrons ranges from 10-14 to 10-20 C cm2/n, and has a response time of 3 ns （FWHM）. The proposed detector is also highly flexible. For instance, the probe can be set close to the source, while the PMT can be placed far away from radiation, allowing easy shielding. Due to these characteristics, pulsed fission neutrons in the vicinity of the source can be accurately measured.

关 键 词：organic scintillation fiber pulsed neutron detection n/γ sensitivity ratio energy response UV optical fiber 

分 类 号：TH[机械工程]