New thermoluminescent dosimeters (TLD): optimization and characterization of TLD threads sterilizable by autoclave.
To improve the performance of mono-extruded TLD threads as a dosimetric thermoluminescent tool (French Patent 9903729), a new process was developed by co-extrusion methodology leading to threads of 600 microm diameter with a 50 microm homogeneous polypropylene sheath. In this optimization work, study of parameters such as LiF:Mg,Cu,P powder granulometry, load rate and proportion of components led to an increased sensitivity of around 40%. Moreover, the co-extrusion technique allowed the threads to be sterilized by humid steam (134 degrees C/18 min) without significant variation of the linearity response between 0 and 30 Gy after gamma irradiation (60Co).
Jarnet
D
D
Inserm ERIT-M 0104, 10 rue A. Boquel, 49100 Angers, France.
Denizot
B
B
Hindré
F
F
Venier-Julienne
M C
MC
Lisbona
A
A
Bardiès
M
M
Jallet
P
P
D002138:Calibration; D003300:Copper; D004305:Dose-Response Relationship, Drug; D005720:Gamma Rays; D008274:Magnesium; D008420:Manufactured Materials / Q000032:analysis*; D018613:Microscopy, Confocal; D010316:Particle Size; D010758:Phosphorus; D017785:Photons; D011126:Polypropylenes; D011208:Powders; D013242:Sterilization; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation / Q000379:methods*
D011126:Polypropylenes; D011208:Powders; D010758:Phosphorus; D003300:Copper; D008274:Magnesium