Kumar Deepak, Kumar Avinash, Sharma A K, Singh B, Ravi P M, Sarkar P K
Environmental Survey Laboratory, Environmental Studies Section, Health Physics Division, Bhabha Atomic Research Centre, Narora Atomic Power Station, PO NAPP Township, Narora, District Bulandshahr, Uttar Pradesh 202 389, India.
Radiat Prot Dosimetry. 2013 Sep;156(2):223-30. doi: 10.1093/rpd/nct058. Epub 2013 Mar 27.
Site-specific transfer coefficient from feed to cow's milk, for (137)Cs in the villages around Narora, a nuclear power station site in India, determined over a period of 17 y, is presented in this paper. In the transport model for the prediction of the concentration of (137)Cs in milk, the transfer coefficient from feed to milk, Fm, is an important parameter. The transfer coefficient value is determined from (137)Cs concentration in milk and grass samples of the Narora region, and the result ranged from 4.28E-03 to 3.30E-02 d l(-1) with a geometric mean value of 1.15E-03 d l(-1). The highest and the lowest values were only below one order of magnitude different from the mean, regardless of the type of diet, milk yield and age of the cow. The result is compared with that for (40)K, determined concurrently at the same region and ranged from 6.92E-03 to 8.01E-03 d l(-1) with a geometric mean value of 7.45E-03 d l(-1). This parameter is quite useful in decision-making for implementing countermeasures during a large-area contamination with (137)Cs in tropical areas like Narora. The ingestion dose from fallout (137)Cs through milk intake for adult and child is also estimated.
本文给出了印度核电站所在地纳罗拉周边村庄中，特定地点从饲料到牛奶的（137）铯转移系数，该系数是在17年的时间里测定的。在预测牛奶中（137）铯浓度的传输模型中，从饲料到牛奶的转移系数Fm是一个重要参数。转移系数值由纳罗拉地区牛奶和草样中的（137）铯浓度确定，结果范围为4.28E - 03至3.30E - 02 d l(-1)，几何平均值为1.15E - 03 d l(-1)。无论奶牛的饮食类型、产奶量和年龄如何，最高值和最低值与平均值的差异仅在一个数量级以内。将该结果与在同一地区同时测定的（40）钾的结果进行了比较，（40）钾的结果范围为6.92E - 03至8.01E - 03 d l(-1)，几何平均值为7.45E - 03 d l(-1)。该参数在像纳罗拉这样的热带地区发生大面积（137）铯污染时实施应对措施的决策中非常有用。还估算了成人和儿童通过摄入牛奶从沉降（137）铯中摄取的剂量。
