Synthesis, thermoluminescence, defect centers and dosimetric characteristics of LiF:Mg,Cu,B phosphor.
The present paper reports the thermoluminescence (TL), dosimetric characteristics and electron spin resonance (ESR) of LiF: Mg, Cu,B (MCB) phosphor synthesized by a solid state method. Its glow curve structure is similar to that of LiF: Mg, Cu,P (MCP) phosphor with the main dosimetric peak at 218°C. MCB is 12 times more sensitive than LiF: Mg, Ti and about 1.9 times less sensitive than MCP phosphor. A noteworthy feature is that the phosphor exhibits a linear dose response up to 100Gy with a minimum detectable dose of 17μGy. The TL emission spectrum was recorded and the post irradiation fading in MCB at ambient temperatures and humidity was negligible for a period of one month. Room temperature ESR spectrum of irradiated phosphor consists of at least two distinct centers. Center I with an isotropic g factor 2.0061 is attributable to an F-center and is the likely recombination center for the main TL peak at 220°C. Center II characterized by a g-factor 2.0090 and an unusual broad line (linewidth ~ 415G) is also identified as an F-center. A third defect center, observable during thermal annealing at high temperature, is assigned to another F-center.
Solid State Chemistry Research Laboratory, Department of Chemistry, Velammal Engineering College, Surapet, Chennai 600066, India.
Prince David
PD
Preto
Solid State Chemistry Research Laboratory, Department of Chemistry, Velammal Engineering College, Surapet, Chennai 600066, India. Electronic address: vidya3000@gmail.com.
Vidyavathy
V
Balraj
Radiological Physics and Advisory Division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India.
Bhushan S
BS
Dhabekar
Institute of Physics, University of Sao Paulo, 05508-090, Sao Paulo, SP, Brazil.
S
S
Watanabe
Institute of Physics, University of Sao Paulo, 05508-090, Sao Paulo, SP, Brazil.
T K Gundu
TKG
Rao
Defect centers; Dose response; Electron spin resonance; Solid state reaction; Thermoluminescence emission; Thermoluminescence phosphor