Thermoluminescence characteristics of teflon embedded CaSO4:Dy TLD.
The Korea Atomic Energy Research Institute (KAERI) is manufacturing CaSO4:Dy Teflon TL pellets which have more sensitivity and stability than commercial TLD. A method is presented of preparing the CaSO4:Dy phosphor-embedded Teflon powder, which is then compressed to a thin pellet form used as the TLD element. Investigations are made to determine optimum preparation conditions and dosimetric characteristics of the CaSO4:Dy Teflon pellet such as the sensitivity, energy response, dose response, fading, re-usability, and lowest level of detection. The results show that the sensitivity of the CaSO4:Dy pellet is 2 times higher than that of the commercial Teledyne CaSO4:Dy pellet. A dose-response was observed to be linear in the range from 10(-5) to 10 Gy. The relative energy response in the low energy region was 9.6 (normalised to the 137Cs gamma source), and the fading rate was about 10% for five months. The re-usability was estimated to be more than 60 cycles, and the low level of detection dose was 22 microGy. From the results, the CaSO4:Dy pellet developed in KAERI can be successfully used in personal dosemeters through appropriate filter design for compensating the energy response.
Yang
J S
JS
Health Physics Dept, Kore Atomic Energy Research Institute, Daejeon. ex-yjs@kaeri.re.kr
Kim
D Y
DY
Kim
J L
JL
Chang
S Y
SY
Nam
Y M
YM
Park
J W
JW
D002133:Calcium Sulfate / Q000737:chemistry / Q000528:radiation effects*; D004419:Dysprosium / Q000737:chemistry; D005720:Gamma Rays; D008163:Luminescent Measurements; D011138:Polytetrafluoroethylene / Q000737:chemistry; D011854:Radiochemistry; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000379:methods* / Q000706:statistics & numerical data
D004419:Dysprosium; D011138:Polytetrafluoroethylene; D002133:Calcium Sulfate