Abstract: g /ml LB juicer(prepared from Lycium barbarum L.)was orally administered to a group of mice(LBJ group),while the chow with 5%LB powder was s upplied to another group(LBP group).A normal control and an experimental control were also arranged.After the four groups of mice were fed for 15d,the three groups(LBJ group,LBP group,and the experim ental group)were exposed to 8.5Gy γ-rays and the survival rates recorded.In another experiment,a LBJ group,a LBP group,and an experimental control were fed for 12d,then,the three grou ps were exposed to 3.0Gy γ-rays.After 6d,the number of white blood cells(WBC)and lymphocytes(W-SCC)were counted,the lipidperoxidatio n level(LPO)in spleen and liver were determined and the mic ronucleus frequency(MF )of polychromatic erythrocytes and t he sperm aberration frequcncy(SF)were also observed.The results show ed that LBJ and LBP raised the survival rates by 20%and 30%,respec tively,lowered LPO levels,protected WBC and W-SCC to some extent,decreased MF by 62.5%and 64.3%respectively and lowered SF by 39.5%and 44.2%,re-spectively.Hence LBP has shown rema rkable radioprotective effects.

Key words: lycium barbarum L, radioprotectiv e effect