Dosimetric characterization of wollastonite‐teflon composites

Abstract

In this work, the thermoluminescent properties of pellets containing powdered Wollastonite embedded in Teflon were studied. The preliminary results using gamma rays from a 60 Co source showed linearity at the calibration curve between 0.5 Gy and 10 Gy. The main TL peaks are located at 125, 200 and 245 °C. The repeatibility of TL response presented a maximum coefficient of variation of 6.3%. The material can be used in successive irradiation-reading-annealing cycles without an appreciable change in its sensitivity. The calibration curve for a gamma source ( 60 Co) up to 20 kGy and the minimum detection limits were obtained. The results show that these Wollastonite-Teflon pellets present possibilities for use as TL dosimeters.

Oxygen tracer diffusion in amorphous hafnia films for resistive memory

“…2b-e). 27 The annealed samples show broadened 18 O profiles, signifying oxygen tracer diffusion. These diffusion profiles were fitted (blue line) to Crank's solution, which is an analytical solution to Fick's laws of diffusion.…”

Thermoluminescent composites of sintered synthetic-topaz/in situ corundum for dosimetry by a novel reversible process

“…Significant progress has been made by developing different materials of natural topaz [ [8] , [9] , [10] , [11] ], synthetic topaz [ [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] ], beach sand-Teflon composites [ 22 , 23 ], wollastonite-Teflon composites [ 24 ], citrine-Teflon [ 25 ], and natural topaz composites [ 1 , 7 , [26] , [27] , [28] ]. Recently, sintered synthetic topaz/corundum compounds – obtained by the hybrid-system chemical vapor deposition or HYSY-CVD route, developed at CINVESTAV-Saltillo [ [29] , [30] , [31] ]– with thermoluminescent behavior were reported [ 32 ].…”

Production of synthetic polycrystals of CaSiO3 and their study as new detectors of gamma radiation, thermal neutrons and accelerated ions.

“…is an interesting material for study in mineralogy, either in its natural or synthetic form, by the different polytypes described in many studies [88,[91][92][93][94][95][96][97][98][99][100][101][102] and 225 • C with the higher intensity at 200 • C and a third TL peak can be observed at 245 • C, overlapped at the end of the second peak [122]. The dosimetric TL peak at 200…”

“…The measurement of the gamma irradiation effects and thermal treatment employing the EPR technique, in this material, is an attempt to understand those physical properties dependent on EPR point defects. Furthermore, the high sensitivity that is shown by wollastonite, both natural and synthetic form, to gamma radiation [41,120,122] make it an interesting material of study not only for electromagnetic radiation but also charged accelerated particles as well as neutrons when doped with elements of high neutron capture cross section.…”