cell inactivation and induced mutation frequencies at the hypoxanthine-guanine phosphoribosyl transferase ( hgprt ) locus have been measured in cultured human fibroblasts ( gm10 ) exposed to alpha particles from 238pu ( let at the cell surface was 100 kev/microns ) and 250 kvp x rays .
C0007634
cell
C1708726
locus