Dosimetric Study Of TLD-100 And Feasibility Of Silica Fibre And Polyethylene As Dosemeters
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Date
2015-06
Authors
Jamaludin, Farakhdina
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Abstract
A total of 35 TLDs were exposed to the x-ray photons with energy of 80 kVp
and 100 mAs in air with distance from TLD surface to X-ray tube focal spot equal to 80
cm and the field size was collimated to 10 x10 cm2. Only 30 TLDs are within the range
of 1.05 to 0.95 (±5%). Another 5 TLDs were found to be response out of range (i.e. >
±5%), of which TLDs numbered 24, 25 and 28 have to be discarded and TLDs numbered
1 and 10 lack of reproducibility of a TLD response. The latter affects the precision of a
TLD reading. The reproducibility of each TLD is the standard deviation of the mean
response of that TLD after repeated measurements of the same exposure under similar
irradiation and reading conditions. Thus, TLDs screening is essential to increase the TL
reproducibility because of the individual differences between the TLD responses. Only
30 TLDs were used in this research since all them has a good reproducibility and
precision. The study focused on the determination of absorbed dose with different
values of peak voltage (kVp) using diagnostic X-ray machine and the TLD dose were
calculated using Harshaw-3500 TLD reader with Win REMS software. From the
determination of absorbed dose with different values of peak voltages (kVp), showed
that all the result of R2 is approximately equal to 1 of which the curve is linear. In
addition, the research also focused on the feasibility study of silica fiber and
polyethylene as TLD. From the result obtained, it can be concluded that polyethylene
melts at temperature of 150 °C. The colour of polyethylene becomes yellow when
annealing at 150 °C. There are no colour changes while the temperature is below 130
°C. For annealing at 400 °C, the polyethylene melts with black in colour. It is not
feasible to fabricate the TLD before hardened the polyethylene
Description
Keywords
TLD-100 , Silica Fibre