采用60Coγ射线源不同辐照剂量处理蓝莓果实,考察其感官及外观品质变化情况。试验结果表明:60Coγ辐照处理是提高蓝莓冷藏品质和延长贮藏期的有效方法;辐照剂量不同,影响效果也大不相同,其中以1.0~2.5 k Gy辐照处理效果为好,确定辐照蓝...采用60Coγ射线源不同辐照剂量处理蓝莓果实,考察其感官及外观品质变化情况。试验结果表明:60Coγ辐照处理是提高蓝莓冷藏品质和延长贮藏期的有效方法;辐照剂量不同,影响效果也大不相同,其中以1.0~2.5 k Gy辐照处理效果为好,确定辐照蓝莓的最低有效剂量为1.0 k Gy,最高耐受剂量为2.5 k Gy。该结果可为蓝莓辐照保鲜提供现实的应用基础和科学依据。展开更多
目的完成辐照实验装置达到寿期的18枚^(60)Co源安全回收。方法系统地分析了倒装源作业流程存在的风险,对作业过程的安全与防护进行最优化设计。结果在5 m Sv的剂量控制范围内顺利完成倒源并打包成符合放射性物质运输的货包。结论通过优...目的完成辐照实验装置达到寿期的18枚^(60)Co源安全回收。方法系统地分析了倒装源作业流程存在的风险,对作业过程的安全与防护进行最优化设计。结果在5 m Sv的剂量控制范围内顺利完成倒源并打包成符合放射性物质运输的货包。结论通过优化设计,既防止了放射源失控、人员超剂量照射的潜在风险,又将操作人员的受照剂量降到尽量低的水平。展开更多
To verify quality of irradiated products by a 3.9PBq single plate (1m×1m) source, Ag2Cr2O7 dosimeters were used for measuring extreme doses in three kinds of Chinese medicine in a actual irradiation area of 1.4m&...To verify quality of irradiated products by a 3.9PBq single plate (1m×1m) source, Ag2Cr2O7 dosimeters were used for measuring extreme doses in three kinds of Chinese medicine in a actual irradiation area of 1.4m×1.4m facing the source. The product cartons were piled on the irradiation area, and their positions were exchanged to improve dosimetry uniformity of the products. The dosimeters for monitoring the minimum dose were placed in center of the cartons. The minimum doses of the three kinds of Chinese medicine products were 2.98, 1.03 and 1.37kGy respectively, and the maximum doses were 4.61, 2.00 and 2.24kGy, respectively. The dosimetry uni- formities were 1.55, 1.94 and 1.64, respectively, which are within the quality control requirement of U≤2.展开更多
文摘采用60Coγ射线源不同辐照剂量处理蓝莓果实,考察其感官及外观品质变化情况。试验结果表明:60Coγ辐照处理是提高蓝莓冷藏品质和延长贮藏期的有效方法;辐照剂量不同,影响效果也大不相同,其中以1.0~2.5 k Gy辐照处理效果为好,确定辐照蓝莓的最低有效剂量为1.0 k Gy,最高耐受剂量为2.5 k Gy。该结果可为蓝莓辐照保鲜提供现实的应用基础和科学依据。
文摘蒙特卡罗方法是目前准确的吸收剂量率计算方法,但其较长的模拟耗时阻碍了它在工业钴源辐射加工和辐照实验中的应用。模拟耗时、模拟精度以及模拟值与实测值的相对偏差是表征蒙特卡罗计算效率的重要指标。针对8.4 PBq的单板钴源辐照装置,讨论了并行线程数、记数方法、记数栅元尺寸、γ致电子的处理方式和截断能5种参数对蒙特卡罗程序MCNP吸收剂量率计算效率的影响。利用实验测量结合模拟试算的方法,给出了在保证一定精度和相对偏差前提下,使得模拟耗时最少的参数组合,提高了MCNP计算效率。结果如下:超线程模式下的并行计算、*F6记数方法、栅元边长为1 cm、γ输运模式、γ截断能为100 ke V。
文摘目的完成辐照实验装置达到寿期的18枚^(60)Co源安全回收。方法系统地分析了倒装源作业流程存在的风险,对作业过程的安全与防护进行最优化设计。结果在5 m Sv的剂量控制范围内顺利完成倒源并打包成符合放射性物质运输的货包。结论通过优化设计,既防止了放射源失控、人员超剂量照射的潜在风险,又将操作人员的受照剂量降到尽量低的水平。
文摘To verify quality of irradiated products by a 3.9PBq single plate (1m×1m) source, Ag2Cr2O7 dosimeters were used for measuring extreme doses in three kinds of Chinese medicine in a actual irradiation area of 1.4m×1.4m facing the source. The product cartons were piled on the irradiation area, and their positions were exchanged to improve dosimetry uniformity of the products. The dosimeters for monitoring the minimum dose were placed in center of the cartons. The minimum doses of the three kinds of Chinese medicine products were 2.98, 1.03 and 1.37kGy respectively, and the maximum doses were 4.61, 2.00 and 2.24kGy, respectively. The dosimetry uni- formities were 1.55, 1.94 and 1.64, respectively, which are within the quality control requirement of U≤2.
