Abstract
Abstract The effect of thermal neutron irradiation due to the B10(n, α)Li7 reaction on the elastic wave velocities and the elastic moduli of tourmaline crystals has been studied. Oriented tourmaline samples have been irradiated with thermal neutrons to 7.6 × 1018n/cm2 and the elastic wave velocities determined by ultrasonic measurements. The elastic wave velocities are not affected by thermal neutron irradiation below 8 × 10l7n/cm2, effects starting to appear at approximately 1 × l018n/cm2 with more important decreases of the elastic wave velocities and of the bulk moduli at fluences of 2.9 × 10l8n/cm2 and 4 × 10l8n/cm2. The decrease of the bulk moduli of the irradiated tourmalines is compared with that of metamict zircons. X-ray diffraction of the irradiated specimens indicates that tourmaline remains crystalline up to a thermal neutron fluence of 7.6 × 1018n/cm2.
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