01011nam a2200265 i 450099100116665970753620020507112140.0970308s1988 at ||| | eng b10183000-39ule_instLE00643255ExLDip.to Fisicaita53.9.786International atomic energy agency 12873Principles for the exemption of radiation sources and practices from regulatory control /IAEAVienna :IAEA,19881 v.Safety series ;89Radiation protectionRadiation-Safety measures.b1018300017-02-1727-06-02991001166659707536LE006 53.9.786 IAE12006000055789le006-E0.00-l- 00000.i1022429427-06-02Principles for the exemption of radiation sources and practices from regulatory control190675UNISALENTOle00601-01-97ma -engat 01