TRANSFER OF RADIOCESIUM FROM PODZOL TO RYEGRASS AS AFFECTED BY AFCF CONCENTRATION

The possible use of ammonium-ferrichexacyano-ferrate (AFCF) as a count ermeasure for soil-plant transfer of radiocaesium is evaluated. On a s andy agricultural soil, AFCF application rates of 10 and 100 g AFCF m( -2) reduced radiocaesium transfer to ryegrass by a factor of 25 and 22 5, respectively, without affecting plant growth. Even additions of onl y 1 g AFCF m(-2) resulted in a 4-fold reduction of the radiocaesium tr ansfer factor. Additions of less than 0.1 g AFCF m(-2) were not effect ive in reducing radiocaesium transfer to rye grass. Reductions in tran sfer with AFCF addition can be estimated and have been quantified usin g an appropriate regression equation.