Voigt G, Rauch F, Paretzke H G
GSF-Institut für Strahlenschutz, Neuherberg, Germany.
Health Phys. 1996 Sep;71(3):370-3. doi: 10.1097/00004032-199609000-00015.
The longterm behavior of 137Cs in milk of a Bavarian farm (farm A) deposited as a consequence of the Chernobyl accident has been followed from April 1986 until August 1994. On the basis of activity measurements in milk and feed, transfer coefficients for the different seasons have been estimated in order to see any changes in transfer behavior (aging effect) of 137Cs with time. The influence of different grazing regimes has been tested by comparison of activity concentrations in milk and pasture grass in one farm (farm A with rotational grazing regime) with that of a nearby farm (farm B with continuous grazing regime) over a complete grazing season by frequent measurements in 1993. Though the farms are located only 4 km apart, have similar soils, and were contaminated to the same extent by the Chernobyl fallout, tenfold lower 137Cs activity concentrations in milk have been observed in farm B. This finding seems to be partly due to the influence of a different grazing intensity.
自1986年4月至1994年8月，对因切尔诺贝利事故沉降在巴伐利亚一个农场（农场A）牛奶中的137Cs长期行为进行了跟踪。基于牛奶和饲料中的活度测量，估算了不同季节的转移系数，以便观察137Cs的转移行为（老化效应）随时间的任何变化。1993年通过频繁测量，比较了一个农场（采用轮牧制度的农场A）与附近一个农场（采用连续放牧制度的农场B）在整个放牧季节牛奶和牧草中的活度浓度，测试了不同放牧制度的影响。尽管这两个农场相距仅4公里，土壤相似，且受切尔诺贝利沉降物的污染程度相同，但在农场B中观察到牛奶中137Cs活度浓度低了十倍。这一发现似乎部分归因于不同放牧强度的影响。
