PROCESS FOR MAKING A SOLID BODY INTEGRATOR DOSEMETER BASED ON RADIO THERMOLUMINESCENCE EMISSION

摘要

The invention relates to a process for making a solid body integrator dosemeter based on radio thermoluminescence emission for measuring doses of gamma-, X-, beta-rays, accelerated electrons and neutrons. According to the invention, the process consists in preparing the Mg fluoride from MgO and a Mn salt as an activator, in a ratio of 1.5 mole% of Mn, adding HF in a stoichiometric amount as related to the MgO, then admixing distilled water while agitating by ultrasounds, for 25...30 min, the resulting compound representing a mixture of mixed Mg and Mn fluorides as polycrystalline powder with variable content of hydration water which, after removal of the liquid phase, is washed with bidistilled water until a neutral pH is reached and dried for 20...30 min in a vacuum oven, the resulting compound being then introduced into a graphite crucible with graphite lid, covered with a 2...3 cm-thick graphite layer and afterwards the crucible is introduced into an electric oven wherein it is heated at a rate of 250°C/h up to a temperature of 1000...1050°C, it is maintained at this temperature for 30 min and then is subjected to a slow cooling inside the oven until the ambient temperature is reached, to result in a hard compact light-grey solid body which is cleaned to remove the graphite traces and is ground, finally there being subjected to a chemical treatment with an aqueous HCl solution, in a concentration of 20%, for 30 min, followed by washing with bidistilled water and drying under vacuum, thereby reaching characteristics which permit dose measurements in ranges of 1 mRad...5 x 10Rad.