I'm my previous message concerning lab and rest areas, I assumed ,of course, that proper care and attention is given to storage areas (shielding) ,possibility of airborne actvity , total activity manipulated and type of isotope involved... Stephane JF RSO Gestion du Risque\Risk Management Merck Frosst Canada * 514.428.8695 Fax: 514.428.4917 *stephane_jeanfrancois@merck.com