Design of a positionally sensitive laser-heated thermoluminescent detector system.
The design and performance of a positionally sensitive system for the laser read-out of dosimetric information contained in LiF chips and a specially designed composite detector having a thin LiF layer is reported. A 2 cm X 3 cm X 0.254 mm LiF layer was successfully manufactured with a glass backing; however, this was subject to thermal cracking at high temperatures encountered with laser heating. Multiple spot heating of this plate resulted in dosimetric images having a spatial resolution of approximately 2.5 mm, limited primarily by the laser beam radius, a homogeneity of better than 10%, a reproducibility of less than 7%, and a minimum detectable dose of approximately 3.12 X 10(-4) C kg-1 (1.21 R). Observed glow curves were consistent with those predicted theoretically using a first-order kinetic model and assuming rapid heating conditions. Several images of positional radiation dose produced using an x-ray machine are presented.
Kearfott
K J
KJ
Nuclear Physics Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332-0225.
Grupen-Shemansky
M E
ME
D004867:Equipment Design; D006358:Hot Temperature; D007834:Lasers; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*