TITLE:
Developing Suitable Sensitive Compound Semiconductor Materials Doped by Transition Metals for Occupational Thermoluminescence Dosimetry
AUTHORS:
Salahuddin M. Kamal
KEYWORDS:
Doped Semiconductor Materials, Thermoluminescence Glow Curve Analysis, Occupational Dosimetry, High Gamma-Ray Dose
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.6 No.4,
April
12,
2016
ABSTRACT: The essential
objective of radiation dosimetry is to develop suitable sensitive materials for
different measurements in radiation fields. Our exploration is to find
potentially suitable high gamma radiation dosimeters in the range from 0.5E4 to
1.5E4 Gy. Gamma rays source (60Co, 136 Gy/min) has been used. Many compound semiconductor materials were prepared and investigated. Thermoluminescence
(TL) glow curve was analyzed into its component by analytical segregation program using computerized glow curve deconvolution
(CGCD). Three zero dose
readings for non-irradiated powders of the materials have been taken as lower limit of detection. The results indicated that
some of the tested materials have exhibited TL linearly with respect to dose.
In addition, dose response of these materials was found to be useful for high
radiation dosimetry. Glow curve structures exhibited several peaks
corresponding to the various energies of the emptied traps. Variation in the
standard deviation for reusability cycles has been ten
readout. The fading at ambient temperature was studied up to 60 days
which reached a relative stability (~1.5% for all), 10 days after irradiation.
A typical glow curve of CoPa which irradiated with 1.5E4 Gy was analyzed.
Characterizations of tested materials indicated that crystals of ZnLa:Li, ZnLa:Cd,
and ZnLa:Cr have stable and increasing thermoluminescent responses with high
gamma radiation dose range. Special glow peaks can be used as estimators for
absorbed doses as well as re-estimation for time elapsed exposures.