Thermoluminescence Properties of Novel Self-Agglomerating CaSO₄:Eu Phosphors Obtained by an Environmentally Friendly Method

Abstract

In this work, we report the thermoluminescence (TL) properties of self-agglomerating CaSO4:Eu samples obtained by an environmentally friendly coprecipitation technique. No binding material is needed to form solid CaSO4:Eu samples. Samples exposed to beta particle irradiation exhibit a TL maximum at 473.15 K when a 5 K/s heating rate is used, they are two times more sensitive than the TLD-100 commercial dosimeter, and their lower detection limit was determined to be less than 0.69 mGy. The computerized glow curve deconvolution carried out fitting the residual glow curves from McKeever method revealed that the whole glow curve is composed of four individual TL peaks with intermediate-order kinetics. The main peak order kinetics is b = 1.48. This result agrees with that computed using Chen’s formula.

Synthesis and characterization of high‐sensitivity Dy,Eu co‐doped CaSO4 thermoluminescent phosphor using coprecipitation technique

“…When comparing CaSO 4 :Eu with the previously prepared TL compositions of CaSO 4 , it was found that CaSO 4 :Eu was twice as sensitive as TLD‐100 and had a lower detection level of 0.69 mGy. In contrast, the current composition exhibited lower sensitivity, ~0.9 times less sensitive, and a higher detection level of 8.57 mGy [29, 30]. The prepared phosphor has an MDD that was in line with that of the CaSO 4 :Tb,Eu phosphor, which had an MDD of 4.72 mGy [13].…”