ACEESC) BOM REA September 21, 195) Mr. H. ¥. Morgenthaler Insurance Manager BES rolstron, Incorporated Be eeeey venus T COPY AVAILABLE Bear Mr. Morgenthaler: Thank you for your letter of August 11, 1954. Our recommendations for the control of beryllium hazards include: 1. The in-plant atmospheric concentration of beryllius at beryllium operations should not exceed 2? micrograms per cubic meter as an average concentration throughout an S-hour day. 2. Even though the daily average might be within the limits of Recommendation 1, ne personnel should be exposed to a concentration greater than 25 micrograms per cubic meter for any period of time, however short. 3e In the neighborhood of an AEC plant handling beryilium compounds, the average monthly concentration at the breathing zone level should not exceed 0.01 microgram per cubic meter, h. There should be an adequate medical program, super- vised by a physician who is familiar with beryllium poisoning, to cover all workers exposed to bery]llium and its compounds. S. If there is ary evidence that an individual has chronic berylifum poisoning, such an individual should be excluded from any further exposure to beryllium compounds « 6. Beryllinm operations should be carried on in as few Places as US DOE ARCHIVES 326 U.S. ATOMIC ENERG COMMISSION - RG DCzw HA shriceol pp) Collection Box Folder ‘>: //I Ss SES Ss DO’ ARCHIVES