Dosimetric properties of Mn²⁺-doped Ca₂BO₃Cl

Abstract

We synthesized Ca2BO3Cl with various amounts of MnCl2 to fabricate phosphors for radiation dosimetry. After the synthesis, we evaluated their scintillation, thermally-stimulated luminescence (TSL), and optical stimulated luminescence (OSL) characteristics. A scintillation peak derived from the 4T1→6A1 transition of Mn2+ appeared at approximately 600 nm in the MnCl2-doped Ca2BO3Cl. Further, their decay time constants were approximately 0.13 ms that should be ascribed to the 4T1→6A1 transition. Moreover, the MnCl2-doped Ca2BO3Cl exhibited TSL glow peaks at approximately 85, 170, and 280 °C. The linear response of the 0.1% MnCl2-doped Ca2BO3Cl was confirmed in the X-ray dose range of 10–3000 mGy. In addition, a weak OSL peak derived from the 4T1→6A1 transition was detected at around 600 nm from the 0.1% and 0.5% MnCl2-doped Ca2BO3Cl.

Dosimetric properties of Tm2O3-doped Ca2BO3Cl

“…The Tm 2 O 3 -doped Ca 2 BO 3 Cl showed several diffraction patterns, which were in agreement with the previously reported ones of Ca 2 BO 3 Cl (ICDD, No.01-070-0181), confirming the presence of Ca 2 BO 3 Cl phase in the 0.1%-1.0% Tm 2 O 3 -doped Ca 2 BO 3 Cl. 17,18) Each peak angle was almost constant, regardless of the Tm 2 O 3 concentration, and impurity phases were not obtained. According to previous works, the ionic radii of Tm 3+ is close to that of Ca 2+ ; therefore, Ca 2+ ions could be replaced by Tm 3+ ions.…”

“…According to previous works, the TSL glow peak was not detected from Ca 2 BO 3 Cl with an activator (Dy 3+ , Mn 2+ , Tb 3+ , Eu 2+ ) in the past studies. [17][18][19][20] Therefore, the glow peak should be related to defects induced by Tm 3+ doping. Further, a weak TSL glow peak was observed at around 190 °C, and the peak could be related to an intrinsic defect in a Ca 2 BO 3 Cl host since it was observed from the nondoped Ca 2 BO 3 Cl and Dy 3+ -doped Ca 2 BO 3 Cl.…”

“…Further, a weak TSL glow peak was observed at around 190 °C, and the peak could be related to an intrinsic defect in a Ca 2 BO 3 Cl host since it was observed from the nondoped Ca 2 BO 3 Cl and Dy 3+ -doped Ca 2 BO 3 Cl. [17][18][19][20] Figure 5 displays the TSL spectra of the Tm 2 O 3 -doped Ca 2 BO 3 Cl at 80, 125, 190, and 300 °C. The spectra were measured after X-ray exposure (10 Gy).…”

“…Dy 3+ , Mn 2+ , Tb 3+ ) have been investigated. [17][18][19][20] For instance, the Dy 2 O 3 -doped Ca 2 BO 3 Cl shows two TSL glow peaks at approximately 110 °C and 250 °C, and a linear X-ray dose response curve is obtained in the 0.1-100 mGy. 17) In addition, the Mn 2+ -doped Ca 2 BO 3 Cl shows both TSL and OSL.…”

“…Further, OSL is observed under 600 nm excitation light, and the measurable dose limit is about 1 Gy. 18) Herein, we synthesized Ca 2 BO 3 Cl with various amounts of Tm 2 O 3 . Tm 3+ is a common luminescent center for radiation dosimetry because Tm 3+ -doped compounds show in general visible storage luminescence originating from the 4f→4f transition of Tm 3+ , and Tm-doped CaF 2 is used for TLD-300.…”