高能X射线整车原木辐照检疫中的感生放射性  

Induced radioactivity by high-energy X-ray irradiation of quarantine vehicle logs

作　　者：王秀娟[1] 曹志[1] 张辉[1] 武祯 朱立[1] 

机构地区：[1]清华大学工程物理系,粒子技术与辐射成像教育部重点实验室,高能辐射成像国防重点学科实验室,北京100084 [2]同方威视技术股份有限公司,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第11期1753-1756,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10705019,10775084);国家海洋公益性行业科研专项经费资助项目(2007050228)

摘　　要：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MonteCarlo方法,使用FLUKA程序结合解析经验公式,以25MeV和35MeV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20mSv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。The use of high-energy electron beams or X-rays produced by high-energy accelerators to inspect logs and trailers causes those items to become radioactive resulting in unnecessary radiation exposure to the staff and even to consumers. A Monte Carlo law analysis was used to evaluate the effects of 25 MeV and 35 MeV high-energy X-rays on a log irradiation quarantine system based on the FLUKA program and empirical formulas. Comparison of the dose rates from activated radionuclides produced by 16 MeV, 20 MeV, 25 MeV and 35 MeV radiation beams shows that the induced radiation effects do not have to be considered since the activated radionuclides in logs are all short-lived. However, workers experiencing long-term exposure to the irradiated trailers need to be protected, since only the 16 MeV irradiation meets the 20 mSv per year dose limit for workers.

关 键 词：高能X射线 整车原木辐照检疫系统 感生放射性 MONTE Carlo方法 FLUKA程序 

分 类 号：TL77[核科学技术—辐射防护及环境保护]