Synthesis And Properties Of Terbium Doped Magnesium Silicate

Thermoluminescence?TL?technology is widely used in radiation dosimetry,dating,geology,solid defect analysis and other fields.The production of thermoluminescent dosimeter materials is one of the attracting areas of TL research.LiF: Mg,Cu,P and CaSO₄: Tm are commonly used thermoluminescent dosimeters.Among these,rare earth doped,especially Tb doped Mg₂SiO₄,has been reported to have the strongest thermoluminescence response.Magnesium silicate is a very stable matrix material and it is normally used for the base material to be doped with rare earth ions.The chemical formula of magnesium silicate is Mg₂SiO₄ and it is orthorhombic,Mg²⁺ can occupy the two positions of the octahedron in the crystal,which are noted as M1 and M2.They can bind with the silicate anion to form ionic bond.Mg²⁺ is often substituted by Tb³⁺ in rare earths during doping and thus it has good thermoluminescence and luminescent properties.However,the thermoluminescence of Mg₂SiO₄: Tb is greatly affected by the preparation process,and the luminescent properties of Mg₂SiO₄: Tb prepared by different preparation methods are very different.Even,Mg₂SiO₄: Tb material prepared by high-temperature solid-state reaction has obvious difference characteristics,especially the peak temperatures of thermoluminescence glow curve.It can be seen that the different preparation process leads to the instability of the thermoluminescence peak of Mg₂SiO₄: Tb.In order to solve these problems,the preparation of Mg₂SiO₄: Tb material with stable thermoluminescence properties is studied in this paper.The preparation conditions of Mg₂SiO₄: Tb are studied systematically,and the best prepare method to terbium doped magnesium silicate has been found.The luminescent properties of the prepared powder samples are sintered into dosage sheets,then the dose response and reproducibility are measured.Also compare with some other thermoluminescent materials.The experimental results show that Mg₂SiO₄: Tb can be synthesized at high temperature?more than 1500 ??when Mg₂SiO₄: Tb is synthesized by high-temperature solid-state reaction.In addition,the thermoluminescence properties of samples prepared by changing the ratio of Tb³⁺ and holding time are different,and the luminescence of Tb³⁺ is mainly attributed to the luminescence of Tb³⁺ by three-dimensional thermoluminescence spectra.Compared with the calcination temperature,different holding time and different doping ratio,the thermoluminescence intensity of the sample is the highest when the calcination temperature is 1650 ?,the holding time is 1 h and the doping ratio of Tb³⁺ is 1wt%.Under these conditions,the strongest peak of thermoluminescence appeared in the vicinity of 315 ?,which could be used for daily dose detection.In addition,the material has a high response to ?-ray and ultraviolet radiation,has a wide range of linear dose response and good reproducibility to UV light.Compared with the common thermoluminescent materials?LiF: Mg,Ti,LiF: Mg,Cu,P,and CaSO₄: Tm?has a high sensitivity.