Study On The Thermoluminescence Used For Dose Monitoring In X Ray Radiation Environment

Radioactive environmental monitoring work is one of the basic link of environmentalengineering, thermoluminescence measurement technology for personal dose, dose monitoring isdeveloped from the80’s of last century.Thermoluminescence dete. Thermoluminescence detectorwide range (typically10-5-103Gy), high sensitivity, energy response, no electromagneticinterference, small volume, low degradation, small measuring error, convenient use, wide sourcedetection element, can be made into various shapes, and can be used repeatedly, which is suitablefor the measurement of many kinds of rays,which can be used for routine monitoring, can also beused for accident monitoring.The thermoluminescence measurement is a relative measurement method, at the same timeTLD dosimetry characteristics (in energy storage, luminescence, doseresponse, saturation, lightdegradation, dependent optical response andsensitivity to radiation quality etc), the actualmeasurement process, the measurement accuracy is affected by many factors, even if themeasuredparameters of the same specification of the same type detectors are not exactly the same,in order to obtain the measurement result is accurate, need to adjust the heat to release the bestworking conditions and state of optical measurement system.This paper firstly calculating method on the scale factor of the calibration process, in thecalculation of measurement system calibration process of the scale factor, scale factor using theleast square method and the method of average value calculated can successfully return to the realexposure value of measurement, error within±5%in, can meet the requirement of themeasurement precision. After studying the relative error of the measuring system, the blindsample test and comparison of National Laboratory, blind sample measurement results can becompared with the true values, the relativeerror can be controlled within±5%. In addition, by ablind test comparison,analysis and contrast of80KeV narrow spectrum X ray source,60Costandard source of radiation detector measurement results.After studied factor optimization scale, uncertainty of the measuring system isstudied further,through the choice of detector and regular screening method,control detector annealing method,luminescent system deviation control method,measurement of the experience of the staff, wasmeasured, the radiation workerspersonal dose equivalent Hp(10) measurement uncertainty evaluation. Thealpha is calculated, and the alpha angle alpha test to a total of3factors. After thesame dose experimental study, the different energy ray, responsedifferences, using60Co standardsource calibration dose detector, selection ofthe most widely used, the better performance of LiF(Mg, Cu, P) dose detector energy response stability test.After the optical measurement system is above a series of best workingconditions and stateof research on heat release, research application of.Firstly, research scale, annual dose monitoring of radiation staff265people engaged inscientific research institutions on the medical institutions of Shaanxi,a prefecture level city ofconventional industrial enterprises, a total of71family units, distributing monitoring probe614,through the4batch test, the statistics ofthe area distribution of dose.Finally, by thermoluminescent method for short exposure time (10-7-10-8s) ofdosemonitoring of flash X ray device, test and several direct reading X raydetection instrument used todo comparison, shows that X ray pulse is transmitted to respond more effectively to the flash Xray generatingthermoluminescence, in the main direction of radiation from the X-ray tube within10m, thermoluminescence measurement results and theoretical calculationresults very close to, therelative error is within9%. The monitoring results are accurate and reliable, flash X ray device forradiation protection monitoring is feasible.