Nuclear track radiography of "hot" aerosol particles

Nuclear track radiography was applied to identify aerosol "hot" particles w hich contain elements of nuclear fuel and fallout after Chernobyl NPP accid ent. For the determination of the content of transuranium elements in radio active aerosols the measurement of the alpha-activity of "hot" particles by SSNTD was used in this work, as well as radiography of fission fragments f ormed as a result of the reactions (n,f) and (gamma,f) in the irradiation o f aerosol filters by thermal neutrons and high energy gamma quanta. The tec hnique allowed the sizes and alpha-activity of "hot" particles to be determ ined without extracting them from the filter, as well as the determination of the uranium content and its enrichment by U-235, Pu-239 and Pu-241 isoto pes. Sensitivity of determination of alpha activity by fission method is 5x 10(-6) Bq per particle. The software for the system of image analysis was c reated. It ensured the identification of track clusters on an optical image of the SSNTD surface obtained through a video camera and the determination of size and activity of "hot" particles.