Accession Number : AD0262178

Title :   ELECTRON MICROSCOPE INVESTIGATION ON THE NATURE OF TRACKS OF FISSION PRODUCTS IN MICA

Corporate Author : NATIONAL ELECTROTECHNICAL INST TURIN (ITALY)

Personal Author(s) : BONFIGLIOLI,G. ; FERRO,A. ; MOJONI,A.

Report Date : MAY 1961

Pagination or Media Count : 1

Abstract : Specimens of different micas were examined by the electron microscope, after suitable bombardment to clarify some aspects of the damage caused to crystals by fission products, Biotite, muscovite, artificial fluorophlogopite and muscovite annealed at 900 C (i.e. above the point of loss of crystallization water) were observed after covering with a thin evaporated uranium layer and irradiation in a reactor up to an integrated flux of 10 to the 15th power thermal neutrons/ sq. cm. Tracks appeared on every specimen but biotite; the tracks being larger in muscovite (240 angstrom, thinner in fluorophlogopite (150 angstrom) and still more in dehydrated muscovite (115 angstrom). No tracks were observed in biotite, likely because of too rapid recovery effects. Recovery effects were,observable in muscovite. No recovery effects were observed in fluorophlogopite nor in dehydrated muscovite. (Author)

Descriptors :   *ELECTRON MICROSCOPES, *FISSION PRODUCTS, *MICA, CRYSTAL STRUCTURE, CRYSTALS, FAST NEUTRONS, METALS, NEUTRON REACTIONS, DAMAGE, RADIATION EFFECTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE