In this work

adsorption and migration of 238U and 90Sr in unsaturated soil at a VLLW (very low level waste) site was investigated

in an attempt to find geochemical features of the site. Migration of the isotopes in heterosphere was studied under instantaneous and sequential conditions of the sources. The migration barrier experiment was carried out in two steps on wall rock absorption of the isotopes and addictives to improve the barrier of the wall rock to 90Sr. The results show that the migration speed of 238U and 90Sr in the soil is 0.365 and 0.385 mm/a

respectively. The heterosphere effects on the isotope migration not only alleviated the mainstream contamination

but also prolonged the time of contaminated affection. And false zeolite should be used as barrier additive material for 90Sr migration.