The research of the sterilization and disinfestation by

60

Co γ-radiation and their biological effects on tuber of elevated gastrodia

Chinese angelica and Dangshen have been carried out. The experimental results show that optimal dose was 2×10

5

—6×10

5

rad to kill insect stegofium (L) of three Chinese traditional drugs. The results also show that the content of the chemical composition of irradiated group is similar to control group under 6×10

5

rad. The thin-layer chromatography colour-maculates are almost the same. They have the same Rf exponent.