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本文研究了钻-60的γ-射线(50～100,000伦)和14MeV快中子(累积中子通量1.4×10~(12)中子/cm~2)对维生素B_(12)粉及其浓、稀水溶液的作用。结果表明:钴-60的γ-射线对稀维生素B_(12)水溶液的最低破坏剂量介于2000伦～3000伦之间;辐照100,000伦时,可使其破坏65％以上。钴-60的γ-射线对维生素B_(12)的破坏特点是:稀溶液最易,浓溶液次之,固体粉末不易破坏;破坏程度随辐射剂量的增大而加剧;278nm、361nm、550nm三处特征吸收峰随辐射剂量的增大而逐渐变低平,维生素B_(12)的含量随辐射剂量的增大逐渐降低;产生多种辐解产物。 而快中子,在本试验条件下,对浓、稀维生素B_(12)水溶液无明显破坏作用。
In this paper, the effects of γ-ray (50-100,000 Lun) and 14MeV neutrons (cumulative neutron flux of 1.4 × 10-12 neutron / cm ~ 2) of Dr-60 on vitamin B 12 powder and its Concentrated, dilute aqueous solution of the role. The results showed that the minimum destructive doses of γ-rays of Cobalt-60 to dilute vitamin B 12 aqueous solution ranged from 2000 to 3000. When irradiated by 100,000 Lun, the destructive dose of Cobalt-60 could be more than 65%. Cobalt-60 γ-ray destruction of vitamin B_ (12) is characterized by: the most dilute solution, concentrated solution followed by solid powder is not easy to destroy; damage extent increased with increasing radiation dose; 278nm, 361nm, 550nm tris At the same time, the characteristic absorption peak gradually decreased with the increase of radiation dose. The content of vitamin B_ (12) decreased gradually with the increase of radiation dose. A variety of radiolysis products were produced. The fast neutrons, in this test conditions, the concentration of dilute vitamin B_ (12) aqueous solution without significant damage.