组织等效正比计数器对单能中子响应的测量及模拟

Measurement and Simulation of TEPC's Response to Mono-energetic Neutron

在辐射防护中,组织等效正比计数器(TEPC)可作为主动式剂量计用于中子辐射场监测。采用研制的球形TEPC对加速器单能中子进行测量,获取了0.36、0.65、0.8、1.0、1.3 MeV各单能中子的微剂量谱,根据测得的线能谱计算了吸收剂量和平均品质因子,进一步得到了剂量当量,并与利用注量-周围剂量当量转化因子计算的结果进行了对比。采用FLUKA蒙特卡罗软件模拟了TEPC对各单能中子的响应,并与实验进行了比较。结果发现,理论模拟和实验测量符合很好。实验与理论结果均表明研制的球形TEPC对上述各单能中子具有较好的剂量当量响应。

The tissue equivalent proportional counters are used as active neutron dosemeters in radiation protection.A spherical TEPC was designed and employed for monitoring accelerator-based mono-energetic neutron sources.The microdosimetric spectra of 0.36,0.65,0.8,1.0 and 1.3 MeV mono-energetic neutrons were obtained.The absorbed dose,mean quality factor and dose equivalent value were evaluated from the measured spectra.The comparison between H＊（10）which was calculated based on the transforming factor of fluence to ambient dose equivalent and measured dose equivalent was conducted for each mono-energetic neutron.The FLUKA simulation of TEPC was also implemented for comparison.It is found that the simulated data agree well with the experimental results and both reveal a good dose equivalent response of the spherical TEPC.