copy * Ge Acree |e] United States Atomic Energy Comission Washington, De Ce July 18, 1952 Mr. Seth Woodruff Las Vegas Operations Office Mercury, Nevada 20833 Dear Seth: This will confirm Colonel Hartgering's letter to you of 25 June 1952, in which the permissible radiation dosage for the roll-up operations was specified as 3 roentgens, gamma only, for a ten-week period and with areas showing greater than 10 milliroentgens per hour being found as contaminated and requiring presence of a monitor for film badges and the other accessories for work in contaminated areas, Sincerely yours, /sf/ John John C. Bugher, M.D. we | Director, Division of, © 9 9 oe. * Biology & Medicine ° COPY Yo,