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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Cunbang Yang Jie Feng Chunxiao Su Zhiyuan Liang Yiyun Zhang Lixin Bai |
| Copyright Year | 2006 |
| Description | Author affiliation: Res. Center of Laser Fusion, China Acad. of Eng. Phys., Sichuan (Cunbang Yang; Jie Feng; Chunxiao Su; Zhiyuan Liang; Yiyun Zhang; Lixin Bai) |
| Abstract | Summary form only given. Lead activation system is used to measure very low yield (above $10^{6})$ of DT reaction, and it can also be applied to measure DD reaction neutrons (2.45 MeV). These neutrons produce $^{207m}Pb$ radioactive nuclide by the reaction 208 $}Pb(n,2n)^{207m}Pb$ and $^{207}Pb(n,n)^{207m}Pb$ in Pb sheath that surrounds a NaI(Tl) detector or 1.5 cm thick Pb disks in front of NaI(Tl) detector. Using this detector, adding amplifier, single-channel and multi-channel scaling counting system in computer can measure the 1.06 MeV and 570 keV gamma rays from the $^{207m}Pb$ atoms with 0.8 s half-life decay, and then the yield may be calculated. Because half-life decay of $^{207m}Pb$ atoms is too short to move activated sample to measure room manually or mechanic, the detection system is placed as close as 32 cm from the laser target, the X-rays burst from the laser irradiated target generates about $10^{6}$ times more light intensity in NaI(Tl) detector than does an individual gamma ray from the 207m Pb. To minimize this effect, a gate circuit removes the detector high voltage 200 ms to 1 s adjustable, then restores it less than 100 ms after the shot. The drift of the peak of the pulse-height spectrum is unavoidable because of the NaI(Tl) detectors and the electronic system, it will affect right use of the system. We used an embedded multi-channel pulse height analyzer in multi-channel scaling counting system to adjust the peak of the multi-channel pulse height spectrum in time. It is very easy and fast to adjust the system by this way. This system is calibrated by pulse neutron tube, and it is used successfully in ICF experiment on Shenguang-II facility in 2005. Its rate of signal and noise is above 200, and uncertainty is less than 20% when it is used in measuring neutron yield above $1times10^{7}$ |
| Sponsorship | Plasma Sci. and Applications Comm. IEEE Nuclear and Plasma Sci. Soc |
| Starting Page | 232 |
| Ending Page | 232 |
| File Size | 141849 |
| Page Count | 1 |
| File Format | |
| ISBN | 1424401259 |
| DOI | 10.1109/PLASMA.2006.1707104 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-06-04 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Neutrons Gamma ray detection Gamma ray detectors Atomic measurements Lead Gunshot detection systems X-ray detection X-ray detectors Atomic beams Atom lasers |
| Content Type | Text |
| Resource Type | Article |
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