fallout ratio

The average ratio of~ ( 238) Pu to~ ( 239,240) Pu in seawater is in good agreement with the ratio in fallout in the early 1970's, which implies that plutonium in the Bay of Fundy mainly comes from fallout.

海水中~（238）Pu/~（239'240）Pu的平均值和70年代初期的大气散落物中的比值相同，这说明芬底湾中的钚主要来源于大气散落。

Forecast of the Maximum Water Inflow in Mine Pits by Rise-Fall Ratio Method Under a Steady Environment Producing a very great amount of long-lived radioactive fallout.

深降比法预测稳态环境下矿坑最大涌水量产生大量辐射微尘的产生大量的长期放射性下降物的。

The detection precision is high, the incidence, the fallout ratio and the omission ratio of the non-drilling through hole on the glass product are reduced, and the labor intensity is also reduced.

检测精度高，降低了玻璃制品上未钻通孔的发生率和错、漏检率，也减轻了劳动强度。

Through the analysis of the target system, relations between influential factors in intrusion were searched and an optimal model was built, which would decrease the false retrieval and fallout ratio efficiently.

通过目标系统分析，寻求入侵影响因素之间的关系，建立最优模型，有效地降低了漏检率和误检率。