estimates. In the experiments of Dr. William L. Russell at the Oak niage National Laboratory, it was observed that the induced mutation frequency at low dose rates was about 1/3 that observed at high dose rates. by the BEIR Committees. The factor of 1/3 was used However, Dr. Mary F. Lyon, et al., have analyzed the Russell data along with additional data from experiments at low dose rates. Their analysis shows that as the dose rate dross below some 0.01 (t3) mutation freguency begins to increase. In future est r./fmin., the induced , They conclude: £ tne cenetic haz2ras of envir l radiation, therefore, it « prudent to incre2 k this j re to = seen at a value The value edosted per locus per ren or ain there is little justification fer practices indicate thar the upper Limit estimate should be ” 2? itandaras. zne genetic risk 7tron, Mary °., and oernatoaconia,” »9,LO1-i04. Lif (1/10) is comparable Co. GS. Papworth and Rita J. S. Phillips, :