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利用加速器产生的高能电子束或者高能X射线进行原木辐照处理过程中,原木和车厢有可能会产生感生放射性,从而可能会对工作人员或后续的消费者带来不必要的辐射照射风险。采用Monte Carlo方法,使用FLUKA程序结合解析经验公式,以25 MeV和35 MeV高能X射线装置为例,建立了高能X射线整车原木辐照检疫中的感生放射性计算模型,并比较了16、20、25、35MeV的辐照装置可能产生的感生放射性核素的剂量率。结果表明:由于木材的感生放射性核素多为短寿命核素,故不需要考虑原木被辐照后的感生放射性的影响;但只有16MeV辐照装置能够满足工作人员每年20 mSv的剂量限值要求,因此需要对车厢经过辐照后对工作人员的长期辐照进行防护。
In the process of irradiating logs with energetic electron beams or high-energy X-rays produced by accelerators, logs and compartments may generate induced radioactivity, posing the risk of unnecessary radiation exposure to workers or subsequent consumers. Using Monte Carlo method and FLUKA program combined with analytical experience formula, taking the 25 MeV and 35 MeV high-energy X-ray device as an example, the model of inductive radioactive radiation in quarantine of high energy X-ray car was set up, 20, 25, 35MeV irradiation device may produce the dose rate of the induced radionuclide. The results show that there is no need to consider the influence of induced radioactivity after the wood is irradiated because most of the induced radionuclides are mostly short-lived nuclides. However, only the 16 MeV irradiation device can meet the staff dose limit of 20 mSv per year Value requirements, the need for protection of the long-term exposure of staff after irradiation of the carriage.