PC Controlled TL / OSL Research Reader
ratureprofile.Ofcoursecommunication between PC&TL research reader unit isthrough USB serial port.6.3 Temperature ProfileIt also allows the user to determine the heating rate towhich the TL phosphor sample placed on thekanthalstripis subjected to acquire the required glowcurve. Also this software has the option of configuring theheating profile for single, two or three plateau heatingprofiles, witha facility to clamp the temperature to anyvalue for required time duration. Of course cooling ofthesample / heater strip is by natural cooling method only byFig. 6: Temperature profile configuration dialogboxFigure above shows temperature profile configurationdialog box with at ypical temperature profile. On user’srequest to set the temperature profile the dialog box popsup with default profile loaded into it. If the user wishes tochange the profile he can do it by just keying in thevalues, such as rise time, set temperature, clamping timeand run timeetc.Light Stimulation Profile— It allows the user to configurefor required stimulation intensity and time of acquisition,in both CW and LM modes of OSL acquisition.Change Reader Mode— It allows the user to select anyone of modes of acquisition as follows.TL, CW-OSL (Green), LM-OSL (Green), CW-OSL(Blue) and LM-OSL (Blue).(ii) Acquisition and processing of 200 channel TLdata— Once the required temperature profile isset theuser can go directly for acquisition of 200 channels TLdata for either fixed Wt. Samples orpowder samples. Tochange the sample type either fixed Wt. Samples orpowder samples user has to justclick on the menu optionsample type and select the required sample type. Afteracquisition is done, thedata from the system isautomatically downloaded to the computer’s memory andaglowcurve is plotted with the down loaded data withaline indicating the temperature profile and a curve349
J. Narender Reddy et. al. / Int. J. Luminescence and Applications, ISSN: 2277-6362, Vol. 5, No. 3, August 2015intensity vs time. For better understanding the CasO4glow curve is shown in Fig.7. Once glow curve isacquired it facilitates one to select ROI under the peak. Asshownbelow:Fig. 9: TL-Glow curves shown in overlappedconditionFig. 7: CaSO4 glow curve, afteracquisitionOf course for calibration of the reader, initially one canacquire glow curve with a known exposeddose & obtain‘Reader Factor’ (RF) for the instrument. SubsequentlyR.F. can be used to compute and evaluate doses bymultiplying the R.F. with the integralarea.6.4 Acquisition and Processing of 200 Channel OSLDataFig. 10: Typical GlowcurveSet the system for OSL acquisition in the required mode(LM/CW). Ensure to place appropriate filter combinationin the filter basket for the selected stimulation source(Green/Blue). Place the OSL sample on the sample trayand acquire glow curve, having configured for therequired acquisition parameters. Typical glow curveacquired in CW-OSL mode for LiMgPo4:T6,B is shownbelow.The typical TL glow curve is shown in Fig.10, and theexperimental data is tabulated in Table 1which containsthree parameters: Time, TL intensity andTemperature.Fig. 11: CW-OSL Glow curves in overlapped condition.Fig. 8: LiMgPo4:T6, B Glow curve after acquisition(iii) Saving / opening the acquired data to a disk filefor further access— This command facilitates to save andload data file pertaining to TL/OSL mode.350Fig. 12: LM-OSL Glow curves in overlapped condition.
J. Narender Reddy et. al. / Int. J. Luminescence and Applications, ISSN: 2277-6362, Vol. 5, No. 3, August 2015PERFORMANCE EVALUATION AND RESULTSSystem performance has been studied and the followingare the results, reportedhere.Temperature calibration accuracy test: Temperaturecalibration accuracy has been verified fordifferent profilesand is found to be within /-2 C.HV bias voltage stability, when tested over 8 hours, iswithin /-1voltDosere producibility test is found to be with in arange of /-5% when the discsare exposed and read for thesamedose.Dosimetry linearity test accuracy is within /-2%.System performance can be studied using dose rate inmR/hr vs. integral counts which is shownin Fig.13(a),13(b) and 13(c).The PC controlled TL/OSL instrument can be used tostudy the Thermoluminescence and Optically stimulatedluminance of Phosphors, geological materials, minerals,pottery and for quality check of the instrument[7,8,9].Personnel monitoring is based on the internationalrecommendations of the ICRP [10]. The primaryobjective of individual monitoring for external radiationIs to assess, and thus limit, radiation doses to individualworkers. Supplementary objectives are to provideinformation about the trends of these doses and about theconditions in places of work and to give information inthe event of accidental exposureetc. as reported byMurthy et al. [11,12].ACKNOWLEDGMENTAuthors convey acknowledgment to Mr. K. PurnaKrishna, Testing Engineer who has been associated withthis project in prototype testing and evaluation of thesystem by studying various TL/OSL samples.REFERENCESFig. 13: (a) CW-OSL Performance studyFig. 13: (b) LM-OSL Performance studyFig. 13: (c) TL Performance study[1] Technical datasheet of low dark current PMT9125B, of ET Enterprises Ltd.,U.K.[2] ortheirsemiconductors devicesused.[3] Technical datasheets of ANALOG DEVICES,U.S.A for their semiconductors devicesused.[4] Technical datasheet of MAXIM INTEGRATED,U.S.A for their semiconductor devicesused.[5] TechnicaldatasheetsofPHILIPSSEMICONDUCTORS for their semiconductordevicesused.[6] TechnicaldatasheetsofINTERSILCORPORATION, U.S.A for their semiconductorsdevices used.[7] K.V.R.MurthyandJ.N.Reddy,Thermoluminescence: Basic Theory, Applicationsand Experiments, Published by Nucleonix SystemsPvt. Ltd., Hyderabad, India,2008.[8] M.J.Aitken,ArchaeologicalDating,OxfordUniversity Press, England,1985.[9] Ispra Courses, Applied ThermoluminescenceDosimetry, Lectures of Course held at the JointResearch Centre, Ispra, Italy, 12-16 November1979.[10] ICRP Publication 60, Ann. ICRP 21(1-3), PergamonPress,1991.[11] K.V.R. Murthy, Applications of TLDS in RadiationDosimetry, in: Hardev SinghVirk (Ed.), RadiationDamage Effects in Solids, Trans Tech Publishers,Switzerland, 2013, pp.211- 230.[12] K.V.R. Murthy, Thermoluminescence and itsApplications: A Review, in: Hardev SinghVirk(Ed.), Luminescence Related Phenomena and Its351
J. Narender Reddy et. al. / Int. J. Luminescence and Applications, ISSN: 2277-6362, Vol. 5, No. 3, August 2015Applications, Trans TechPublishers, Switzerland,2013, pp.35-74.[13] tation & Methods: RadiationMeasurements Vol.27,No.5/6, PP.749-768, 1997,1998 Elsevier Science ltd, Printed in Great Britain,1350-4487/98.[14] M.S.Kulkarni, D.R. Mishra, D.N. Sharma, Aversatile integrated system for thermo- urements: NIM B-Beam Interactions withMaterials & Atoms.www.elsevier.com.[15] J.N. Reddy, K.V.R.Murthy, TLD Instrumentation-Acase study of PC controlled TL Reader:EditorHardev Singh Virk, Defect and Diffusion itzerland.352
J. Narender Reddy et. al. / Int. J. Luminescence and Applications, ISSN: 2277-6362, Vol. 5, No. 3, August 2015 348 Kanthal Strip has a circular depression of 14mm to hold discs and powder samples. Additionally flat heater strip
NASA Open Source Agreement 1.3 NTP License Naumen Public License Nethack General Public License Nokia Open Source License Non-Profit Open Software License 3.0 (Non-Profit OSL 3.0) OCLC Research Public License 2.0 Open Group Test Suite License Open Software License 3.0 (OSL 3.0) PHP License
cally stimulated luminescence (OSL) dating techniques (BUSSCHERS 2008; JAIN et al. 2003; WALLINGA 2002). In this study, OSL dating on fi ne-sand and radiocarbon dating on wood was carried out on Holocene material from the gravel pit at Bremgarten in the southern part of the Upper Rhine Graben. The aim
Deutsch-russische Übersetzung I 2st., Mo 12-14 PT 3.0.75 36 345 Rothärmel 1. Teilnahmevoraussetzungen: Erfolgreicher Abschluss der Stufe I (OSL–M 01) oder entsprechende - 3 - LEHRVERANSTALTUNGEN DES INSTITUTS FÜR SLAVISTIK IM WINTERSEMESTER 2006/07 Inhaltsübersicht A. Literatu
clearinghouse for all state, local, campus, and tribal law enforcement training; and ensuring validation of OSL training programs. The Committee was briefed on the State and Local Law Enforcement Training Symposium (SLLETS), the Rural Policing Institute (RPI) bill, the three drug programs delivered by OSL,
measurements of samples collected from the Los Angeles segment of the Puente Hills Blind-Thrust Fault System, Los Angeles, CA, and compare them to OSL and C-14 measurements determined in other laboratories. In the University of Cincinnati Luminescence Laboratory, quartz OSL age estimates were determined for nine samples spanning a depth range from
for pesticide delivery and its applications. Controlled Release Many hydrogel compounds have been researched as controlled-release vehicles for various AIs in agriculture. In controlled-release strategies, the insecticides are slowly delivered over time from the treated surfaces, soil, or plants in a controlled manner (Garrido et al. 2012).
computer controlled devices and sensor controlled devices, describe uses of systems or devices that are controlled by computers, cite examples of where computers control system in response to physical input data captured through sensors and take the learning from the chapter and use it to apply in understanding computer controlled .
second grade levels J/K/L , feature series for readers to study character. Teachers will want to spend the time to set up the Teachers will want to spend the time to set up the classroom library to showcase characters, no matter the reading levels of their readers.
