Beresford N A, Barnett C L, Mayes R W, Pollaris K, Vandecasteele C M, Howard B J
Institute of Terrestrial Ecology, Cumbria, UK.
Radiat Environ Biophys. 1995 Aug;34(3):191-4. doi: 10.1007/BF01211547.
The validity of an in vitro extraction technique to predict the availability for absorption of radiocaesium in the sheep gut has been assessed. The technique (a 2-h extraction with caesium chloride) was found to be valid for sources with a low availability for transfer across the gut, but inappropriate for ionic radiocaesium or radiocaesium incorporated internally within herbage. For such radiocaesium sources, which have a high in vitro availability, no correlation was found between in vitro extraction and true absorption measurements. A true absorption value of 0.80 is recommended for these sources, although values for individual sheep in the range 0.60 to 1.00 should be expected.
已对一种体外提取技术预测绵羊肠道中放射性铯吸收利用率的有效性进行了评估。该技术（用氯化铯进行2小时提取）被发现对于肠道转运利用率低的来源是有效的，但不适用于离子态放射性铯或牧草内部所含的放射性铯。对于这种体外利用率高的放射性铯来源，体外提取与实际吸收测量值之间未发现相关性。建议这些来源的实际吸收值为0.80，不过预计个体绵羊的值在0.60至1.00范围内。
