Transient solution of the diffusion equation for a composite system heated with a laser beam

Abstract

Theory of transient temperature response of a twolayer system heated with a localized laser beam J. Appl. Phys. 60, 3417 (1986); 10.1063/1.337640 Transient solution of the diffusion equation by the finite element method

Mixed field dosimetry using focused and unfocused laser heating of thermoluminescent materials

“…Numerous studies have discussed The heating and glow curve characteristics obtained when laser heat sources are used for local and positional heating of TLDs for both unfocused [Grupen-Shemansky, 19891 and focused lasers [Braunlich et al, 1984;Abtahi et al, 1985;Moreau et al, 1986;Abtahi et al, 1986 b;Kelly et al, 1987;Grupen-Shemansky, 1989;Young et al, 1989;Zangaro et al, 19901. Several applications and practical systems have used lasers to heat TLDs Kearfott et al, 1990 b;Kearfott et al, 1990 c]. Abtahi [Abtahi et al, 1986 b;Kelly et al, 19871 recommends heating the TLD with a laser beam of uniform intensity profile for accurate and sensitive personnel and environmental dosimetry.…”

Basic Characteristics of Laser Heating in Thermoluminescence and of Laser-Stimulated Luminescence

“…7 er is semi-infinite in radial direction (local heating of a small Spatially nonuniform heating significantly increases the respot on a large area) and that no significant heat loss occurs quired computational effort and further complicates this sitdue to convection and radiation. 9 Convection can easily be uation. For this reason, laser heating techniques are exeliminated by evacuation of the sample chamber and radiaplored herein for the sole purpose of assessing their utility in tive losses are indeed small considering the fact that the maxthe dosimetry of ionizing radiation.…”

“…glow peaks we selected as "temperature indicators" for our experiments reach their maximum emission intensity at IV. RESULTS AND DISCUSSION about 250 *C. 9 Consequently, the major portion of the ther-…”

“…To avoid thermal distortion of P = Jf'I (r,0)27rrdr = irw2%o (total power incident on the the shutter blades, they are gold plated for high reflectivity. front surface of the thermoluminescent layer at z = 0) the During the closed position of the shutter, the laser beam is temperature distribution 9 : reflected from the blades into a beam dump which simply reader. 10 adjusted to produce various beam diameters (1.5-6 mm full of four LM555 timers that generate four timing pulses.…”