Hansen H S, Hove K
Department of Animal Science, Agricultural University of Norway, As-NLH.
Health Phys. 1991 May;60(5):665-73. doi: 10.1097/00004032-199105000-00005.
The bioavailability of Chernobyl-derived radiocesium in hay, fungal fruit bodies, willow bark, and soil was compared to tracer radiocesium (134CsCl) by measuring transfer coefficients (Fm) to goat milk. The average Fm value from 134CsCl of 11.9 x 10(-2) d L-1 was taken to represent the maximal transfer to milk on the provided diet. In 1986, the Fm value from hay was 35% of that from 134CsCl, thus demonstrating the low bioavailability of recently deposited radiocesium. Values in 1987 were also lower, with a mean of 76% of that from tracer Cs. During 1988 and 1989, maximal Fm values were observed, suggesting increased bioavailability from the year of fallout to the following years. Transfer of radiocesium from two fungal species harvested in 1988 and 1989 were 78% and 87%, respectively, of that from tracer Cs, while bark was lower (62%). Transfer from organic soil was only 7% of tracer radiocesium, and therefore contribution from soil ingestion could only have a small impact on the content of radiocesium in animals. Live monitoring measurements and the excretion of 134Cs in milk, urine, and feces during a 50-d period was adequately described by a two-exponential equation.
通过测量向山羊奶的转移系数（Fm），将切尔诺贝利地区干草、真菌子实体、柳树皮和土壤中源自放射性铯的生物有效性与示踪放射性铯（134CsCl）进行了比较。取自134CsCl的平均Fm值为11.9×10⁻² d L⁻¹，该值被用来代表在提供的饮食条件下向牛奶的最大转移量。1986年，干草的Fm值为134CsCl的Fm值的35%，这表明近期沉降的放射性铯生物有效性较低。1987年的值也较低，平均为示踪铯的76%。在1988年和1989年观察到了最大Fm值，这表明从沉降年份到随后年份生物有效性有所增加。1988年和1989年采集的两种真菌物种中放射性铯的转移量分别为示踪铯转移量的78%和87%，而树皮的转移量较低（62%）。来自有机土壤的转移量仅为示踪放射性铯的7%，因此通过摄入土壤对动物体内放射性铯含量的贡献可能很小。在50天期间，牛奶、尿液和粪便中134Cs的实时监测测量值和排泄情况可用双指数方程进行充分描述。
