Development of High Dose Rate Sensing Method Based on Cavity Ring-Down Laser Spectroscopy
Development of High Dose Rate Sensing Method Based on Cavity Ring-Down Laser Spectroscopy
复制标题
基于腔衰荡激光光谱的高剂量率传感方法的发展
DOI：
10.1080/18811248.2004.9726436
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发表时间：
2005
影响因子：
1.2
通讯作者：
N. Nariyama
中科院分区：
文献类型：
--
作者：
H. Tomita;Kenichi Watanabe;J. Kawarabayashi;T. Iguchi;N. Nariyama
我们发展了一种基于腔衰荡激光吸收光谱的高辐射剂量率监测新方法，并在532 nm波长下测量了静止和流动空气中60 Co γ射线诱导的化学物种，以检验新方法的基本性能。在静止空气测量中，我们确认了辐射诱导化学物种的吸收剂量和测量的吸光度之间的线性关系。此外，在流动的空气测量中，我们发现响应时间和光吸收的大小在很大程度上取决于空气流量。此外，初步实验证明了该方法对SPring-8的BL 47 XU强波荡器X射线强度监测的适用性。实验结果表明，衰荡率与光子强度成正比，可探测范围为2×1011 ~ 3×1015 photons/s，时间分辨率约为3×102 s。
We have developed a new method for high radiation dose rate monitoring based on cavity ring-down laser absorption spectroscopy and have measured 60Co gamma-ray induced chemical species in stationary and flowing air at the wavelength of 532 nm to check the basic performance of the new method. In the stationary air measurement, we confirmed linearity between the absorbed dose and the measured light absorbance by the radiation induced chemical species. Furthermore, in the flowing air measurement, we found the response time and the magnitude of the light absorbance largely depend on the air flow rate. In addition, a preliminary experiment was done to demonstrate the applicability to an intensity monitor for the intense undulator X-rays of BL47XU beamline at SPring-8. Results showed that the measured ring-down rate is proportional to the photon intensity and the detectable range is from 2×1011 to 3×1015 photons/s with time resolution around 3×102 s.