在萨德伯里中微子天文台用改进的水合氧化钛技术高灵敏度测量水中224 Ra和226 Ra
High sensitivity measurement of 224Ra and 226Ra in water with an improved hydrous titanium oxide technique at the Sudbury Neutrino Observatory
摘要：
萨德伯里中微子天文台（SNO）现有的测量水中224 Ra和226 Ra的水合氧化钛（HTO）技术已经改变，使其更快，对HTO中的微量杂质更不敏感。使用HTIO负载的过滤器，然后通过阳离子交换吸附和HTIO共沉淀，可以从200-450吨重水中提取Ra同位素并浓缩成几毫升的单一样品，总化学效率为50%。结合β-α符合计数，该方法能够在275吨D2 O分析中分别测量2.0x10^3 uBq/kg的232 Th和238 U衰变链中的224 Ra和3.7x10^3 uBq/kg的226 Ra，相当于重水中的5x10^16 g Th/g和3x10^16 g U/g。
英文摘要：
The existing hydrous titanium oxide (HTiO) technique for the measurement of 224Ra and 226Ra in the water at the Sudbury Neutrino Observatory (SNO) has been changed to make it faster and less sensitive to trace impurities in the HTiO eluate. Using HTiO-loaded filters followed by cation exchange adsorption and HTiO co-precipitation, Ra isotopes from 200-450 tonnes of heavy water can be extracted and concentrated into a single sample of a few millilitres with a total chemical efficiency of 50%. Combined with beta-alpha coincidence counting, this method is capable of measuring 2.0x10^3 uBq/kg of 224Ra and 3.7x10^3 uBq/kg of 226Ra from the 232Th and 238U decay chains, respectively, for a 275 tonne D2O assay, which are equivalent to 5x10^16 g Th/g and 3x10^16 g U/g in heavy water.
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