Yamazaki M, Sawai T
Radioisotopes. 1983 Aug;32(8):372-5. doi: 10.3769/radioisotopes.32.8_372.
A river water sample was irradiated with 60Co gamma-rays under aerobic conditions, and the changes of the organic substances in the sample were examined by the analyses of the dissolved organic carbon (DOC), organic composition, UV spectrum and molecular-weight distribution. By the irradiation, the DOC decreased with irradiation dose following the first-order kinetics. In addition, the changes of UV absorption and molecular-weight distribution showed that the considerable decomposition of polymeric aromatic structure, which is the characteristic of humic substances, took place by irradiation of relatively low dose. Since the gamma-ray decomposition does not require any oxidizing agents and pH control, it will cause no compositional change of metallic elements in the water samples and has less chance of contamination. Therefore the method will be useful in, for example, geochemical studies of trace metals in natural waters.
在有氧条件下，用⁶⁰Coγ射线辐照河水样品，并通过分析溶解有机碳（DOC）、有机组成、紫外光谱和分子量分布来检测样品中有机物的变化。通过辐照，DOC随辐照剂量呈一级动力学下降。此外，紫外吸收和分子量分布的变化表明，腐殖质特征性的聚合芳香结构在相对低剂量辐照下发生了显著分解。由于γ射线分解不需要任何氧化剂和pH控制，它不会导致水样中金属元素的组成变化，且污染几率较小。因此，该方法在例如天然水中痕量金属的地球化学研究中将会很有用。
