Abstract: INVESTIGATION OF ~（241）Am IN ENVIRONMENTAL SOIL AND SOME BIOLOGI CAL SPECIMENS AROUND CHINA INSTITUTE OF ATOMIC ENERGY Li Yunlong（China Institute of Atomic Energy，Beijing102413）ABSTRACT The contents of（24 1）~Am in soil ， some species of vegetable and corn are measured． These specimensare collected in the vicinity to fuel reprocessing laboratory，(24 1)~ Am-Be neutron source producing labora-tories of CIAE and．from villeages around CIAE ， respectively. Results investigated show that no observ-able environmental contamination of(241)~ Am could be detected during all the three laboratories in CLAEinvolved in handling（241）~ Am in normal operation. In the area within 1 0 km from CIAE ， the averageconcentration of（241）~Am in soil is 43±14 mBq·kg~（-1）（dry）． On this basis， a conclusion could be de-duced that this value is due to the environmental background as a result of worldwide fallout． The con-centration of（241）~Am in 12 species of vegetable and corn range from 0． 04 to 0． 94 mB·kg~（-1）（fresh），and the transfer factors of（241）~Am from soil to plant by root uptake range from 6．2×10~（-4）to 5．1×10~（-3）． The distribution of（241）~Am in soil profiles showed that more than 74％of deposited（241）~Am has re-mained in the uppermost layer of soil of 0—5cm onsite.Key words（241）~ Am soil vegetable transfer factor sediment.