The radioactive fall-out harm of nuclear burst to crops and its protection

The radioactive contamination in the ground burst center is severe and the contaminated area is often large, as well as the effect of radioactive contamination is long. With different kinds of crops, the effects of external contamination caused by the fall-out are different. The contamination can easily be reduced by wind or rain. On the leaf surface it can be washed off and reduced to 10%. A small amount of fission product can be absorbed through plant roots. It is mainly distributed in leaves and stems. The radioactive contamination of fall-out would damage the crops and reduce the production. After an atmospheric test, the fall-out of 90Sr and 137Cs plays an important role in the biological effects. The absorption and distribution of radioactive contaminants in crops, their chemical states in soil and the measures to reduce the absorbed radioactivity are respectively studied