CFBR-Ⅱ堆脉冲中子注量测量

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Measurement of Pulse Neutron Flux in CFBR-Ⅱ

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;National Engineering Research Center of Nuclear Technology Application in Industry, Mianyang, Sichuan, 621900, China

摘要: 为了监测CFBR-Ⅱ堆辐照空间内脉冲中子注量,根据能谱随空间缓慢变化的特点,选择28个特征点,使用²³⁹Pu电离室对S活化片进行相对刻度,修正了不同空间区域能谱对S活化片测量的影响,测得了特征点的脉冲中子注量。该方法引入的不确定度为5%;脉冲产额为1.10×10¹⁶裂变时,距辐照腔底50mm处脉冲中子注量为5.87×10¹³cm^-2;合成标准不确定度为11%。
- 中子注量 /
- 脉冲堆 /
- S活化片 /
- 电离室
Abstract: To measure the pulse neutron flux in CFBRⅡ, neutron spectrum have to be considered and corrected in different region. Using ²³⁹Pu ionization chamber and Sulphur activation foil, 28 places are calibrated. 5% fractional uncertainty is introduced in the flux measurement. As yield is 1.10×10¹⁶ fissions, pulse neutron flux is 5.87×10¹³ cm^-2 at the point which is 50mm distance from the bottom of radiation chamber, the combined standard uncertainty is 11%.
- Neutron flux /
- Burst reactor /
- Sulphur activation foil /
- Ionization chamber