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- Y77) - STUK-YTO-TR 99 Detection and analysis of radioactive particles using autoradiography Report on task FIN A845 on the Finnish support programme to IAEA safeguards R. Pöllänen, A. Kansanaho, H. Toivonen FEBRUARY 1996 : -''':'''';'. "'-". ','. -V ^; ''.-'... ., ..--:,.- ;* ':.' 1 '":' .*.-„' ' .* '":.".'.'' -- ",;-, :<'.> . - - JV _ -, ,-.'-, -.'-< -i '"i ..--- * i .i SÄTEILYTURVAKESKUS Strälsäkerhetscentralen Finnish Centre for Radiation and Nuclear Safety VOL 2 7 MS 1 5 STUK-YTO-TR 99 FEBRUARY 1996 Detection and analysis of radioactive particles using autoradiography Report on task FIN A845 on the Finnish support programme to IAEA safeguards R. Pöllänen, A. Kansanaho, H. Toivonen Finnish Centre for Radiation and Nuclear Safety Aerosol Laboratory The study was supervised by M. Tarvainen FINNISH CENTRE FOR RADIATION AND NUCLEAR SAFETY P.O.BOX 14, FIN-00881 HELSINKI, FINLAND Tel. +358-0-759881 Fax +358-0-75988433 ISBN 951-712-099-0 ISSN 0785-9325 Oy Edita Ab Helsinki 1996 FINNISH CENTRE FOR RADIATION STUK-YTO-TR 99 AND NUCLEAR SAFETY PÖLLÄNEN, Roy, KANSANAHO, Ahti, TOIVONEN, Harri (Finnish Centre for Radiation and Nuclear Safety). Detection and analysis of radioactive particles using autoradiography. Report on task FIN A845 on the Finnish support programme to IAEA safeguards. STUK-YTO-TR 99. Helsinki 1996. 34 pp + Apps. 2 pp. ISBN 951-712-099-0 ISSN 0785-9325 Keywords: environmental monitoring, autoradiography, radioactive particles, safeguards ABSTRACT Autoradiography was used to study radioactive particles that may be released from the nuclear fuel cycle. Autoradiography suits for pre-screening of the samples. Radioactive particles can be located accurately and detached from the sample for subsequent analyses. A digital scanner and tailored software allow to estimate the activity of the particles by a factor of two to three. High-energy beta emitters as well as pure beta emitters can be identified. A particle with activity of 0.1 Bq can be 5 detected in five days of exposure. More than 10 disintegrations are needed to detect a black spot on the autoradiography film. Total activity of beta active nuclides can be evaluated if the number of 6 disintegrations is smaller than 10 . The diameter of the black spot is then below 1 mm. The edge of the black spot receives a beta dose of approximately 10 mGy. Particular emphasis was placed on method development from the point of view of in-field applications.
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