Thermoluminescence and the Influence of γ-Ray Induced Defects In Single-Crystal α-Al2O3

Abstract

Mapping of the structural perfection of vapor grown αHgI2 crystals by means of γray rocking curves Refractive index and elastic properties of singlecrystal corundum (αAl2O3) up to 2100 K Volume expansion and annealing compaction of ionbombarded singlecrystal and polycrystalline α Al2O3In previous work the thermoluminescence of golden sapphire (AhO. containing Ni and Mg), which was " irradiated under liquid nitrogen, was compared with glow curves of fused borax seeded with Ni and Mg. The emission intensity obeyed, reasonably well, the expression l=aNok'exp[ -1!(dT!dt) t: k'dT J-In the present paper it is shown that light-induced glow curves in ,,-irradiated sapphire have the form of a second-order decay process, namely I =lo [b!(b+t)]m. Gamma-ray induced thermoluminescence in ruby shows dominant emission bands with maxima at about 150 0 K and 240oK. Light-induced thermoluminescence in ')'-ray damaged ruby shows an afterglow long after the crystal has reached room temperature.

Hypersonic Absorption in Quartz at Temperatures Below 30°K

“…The modified properties of irradiated AI2O3 not only are of intrinsic interest, but also provide information about the radiation-damage mechanism; consequently, they have been studied extensively by measurement of optical absorption spectra, 1--5 longwavelength neutron scattering cross sections, 6 thermal conductivity, 7 lattice expansion, 8 and thermoluminescence. 9 However, none of these measurements has provided conclusive identification of the underlying cen-…”

“…The total energy lost per second by the acoustic wave isdW dt = N Q kT(~y/d= N 0 kT{y 2 ) &v S 2 /d,where A^0 is now the total number of thermal phonons and (T 2 ) 9 V a suitable average over directions, presumably of the order of unity. The absorption coefficient, as defined by(9) becomes now N,kT{y% r -[cm" 1 ] with fl 0 being the ultrasonic velocity.…”

Optical properties of Sc-doped Al2O3translucent ceramics for radiation measurements

“…In this work, we chose alumina oxide (Al 2 O 3 ) as the luminescent material to be investigated since it has been one of the most extensively studied materials. [8][9][10] Historically, in the 1950s, non-doped Al 2 O 3 was first suggested as a TSL material 11) but was unable to attract much attention owing to its low sensitivity. 12) Since then, researchers have attempted to dope Al 2 O 3 with various different elements, 11,13,14) such as carbon, 11,15,16) chromium, [8][9][10]17,18) titanium, 8,14,17) magnesium, 14,19) nickel, 9,11,14,17) and other transition elements, 14,20,21) in order to enhance its functionalities.…”

“…[8][9][10] Historically, in the 1950s, non-doped Al 2 O 3 was first suggested as a TSL material 11) but was unable to attract much attention owing to its low sensitivity. 12) Since then, researchers have attempted to dope Al 2 O 3 with various different elements, 11,13,14) such as carbon, 11,15,16) chromium, [8][9][10]17,18) titanium, 8,14,17) magnesium, 14,19) nickel, 9,11,14,17) and other transition elements, 14,20,21) in order to enhance its functionalities. 22) In the 1990s, the dosimetric properties of alumina have been improved by doping with carbon (C:Al 2 O 3 ).…”

Effect of transition metal ion impurities on the thermoluminescence of alumina

“…The radiationinduced defects in this system were attributed [1][2][3][4][5][6][7] to either trapped hole centres or electron traps involving the impurities, but no definite model could be established. In a previous paper [8], we concluded from thermoluminescence (TL) measurements the existence of two groups of TL traps in X4rradiated a-A1203, and a distribution of trapped holes ((3-, 0 ~ stabilized by trace impurities such as Cr, Ti, was made responsible for the TL phenomena of this system.…”