Development of Current Mode Time-of-Flight Technique for Measurement of Thermal Neutron Spectrum
Development of Current Mode Time-of-Flight Technique for Measurement of Thermal Neutron Spectrum
复制标题
热中子能谱测量的电流型飞行时间技术的发展
DOI：
10.1080/00223131.2000.10874998
复制
发表时间：
2000
影响因子：
1.2
通讯作者：
T. Ino
中科院分区：
文献类型：
--
作者：
S. Meigo;F. Maekawa;H. Nakashima;T. Ino
电流模式飞行时间（CTOF）技术是一种测量小脉冲驱动散斑中子源产生的热中子高强度谱的新技术。CTOF技术是在KENS通过测量水慢化剂中产生的热中子而开发和测试的。作为中子探测器，采用了富集6Li和7Li玻璃管，它们与不同类型的光电倍增管耦合。在飞行时间谱中观察到热中子引起的麦克斯韦分布峰。人们认识到，这种技术的时间分辨率足以测量热中子。为了验证CTOF技术的有效性，将其光谱与使用硼载塑料闪烁体的常规脉冲计数TOF技术进行了比较。结果表明，用电流模技术得到的结果与用脉冲计数技术得到的结果符合得很好。结果表明，电流模式飞行时间可用于中子能谱的测量。
A current mode time-of-flight (CTOF) technique was developed as a new technique to measure the high intensity spectra of the thermal neutron produced by the spallation neutron source driven by a few shots. The CTOF technique was developed and tested at KENS by measuring thermal neutrons produced in the water moderator. As a neutron detector, enriched 6Li and 7Li glass scintillators were employed, which were coupled with some different type of photomultiplier tubes. The peak of Maxwell distribution due to the thermal neutron was observed in the TOF spectrum. It is recognized that the time resolution of this technique was well enough to measure the thermal neutrons. For the validation of the CTOF technique, the spectrum was compared with that by a conventional pulse counting TOF technique using boron loaded plastic scintillator. As a result, it is found that the result obtained by current mode technique shows in good agreement with that obtained by the pulse counting technique. It is concluded that the current mode TOF can be applied to the measurement of the neutron spectrum.