ELECTRON MICROSCOPE INVESTIGATION ON THE NATURE OF TRACKS OF FISSION PRODUCTS IN MICA. Technical Note No. 3

Technical Report · Mon May 01 04:00:00 EDT 1961

OSTI ID:4838611

Bonfiglioli, G; Ferro, A; Mojoni, A

To clarify some aspects of the damage caused to crystals by fission products, specimens of different micas were examined using the electron microscope, after suitable bombardment. Biotite, muscovite, and artificial fluorophlogopite and muscovite annealed at 900 deg C were observed after covering with a thin evaporated uranium layer and irradiation in a reactor up to an integrated flux of 10/sup 5/ thermal neutrons/cm/sup 2/. Tracks appeared on every specimen but biotite. The respective diameters of the tracks can be put into correspondence with their different resistance to thermal decomposition: larger in muscovite (240A), thinner in fiuorophlogopite (150A), and still smaller in dehydrated muscovite (115A). These features supported the view that the mechanism of damage occurs through the heat that is released by the heavy ionizing particles. No tracks were observed in biotite, likely because of too rapid recovery effects. Some recovery effects were also observed in muscovite. (auth)

• Research Organization: Turin. Istituto Elettrotecnico Nazionale Galileo Ferraris
• NSA Number: NSA-15-028115
• OSTI ID: 4838611
• Report Number(s): AFOSR-981
• Country of Publication: United States
• Language: English

Related Subjects

CHARGED PARTICLES
CRYSTALS
ELECTRON MICROSCOPY
FISSION PRODUCTS
HIGH TEMPERATURE
IONIZATION
IRRADIATION
MICA
NEUTRON FLUX
PARTICLE TRACKS
PHYSICS
PYROLYSIS
RADIATION EFFECTS
REACTORS
RECOVERY
THERMAL NEUTRONS
URANIUM