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Freiberg

Instruments

GmbH

ּ Am St. Niclas Schacht 13 ּ 09599 Freiberg – Germany

53 / 78

Physical Background

5.1.

Literature

[ 1 ]

M. R. Krbetschek J. Götze, A. Dietrich, T. Trautmann, Radiation Measurement,Vol.

27, No. 5/6,pp. 695-748,1997, Spectral information from minerals relevant for luminescence

dating

[ 2 ]

G. Erfurt

and M.R. Krbetschek,

Ancient TL

Vol. 21 No. 1 2003, IRSAR

– A single-

aliquot regenerative-dose dating protocol applied to the infrared radiofluorescence (IR-RF) of

coarse-grain K-feldspar

Содержание lexsyg research

Страница 1: ...Freiberg Instruments GmbH Am St Niclas Schacht 13 09599 Freiberg Germany 1 78 Manual and documentation lexsyg 2012 10 12...

Страница 2: ...racts is only allowed with a written approval from the Freiberg Instruments GmbH All rights according to copyright subject to Freiberg Instruments GmbH Subject to alterations Freiberg Instruments GmbH...

Страница 3: ...Equipment 13 2 1 Descriptions 14 2 1 1 Module 1 1 1 2 1 3 The Measurement chamber 17 2 1 2 Module 2 1 Beta Irradiation 18 2 1 3 Module 2 2 Alpha irradiation 18 2 1 4 Module 3 Heating unit 19 2 1 5 Mod...

Страница 4: ...ng a sequence to a sample slot 37 3 4 4 Starting a measurement 37 3 4 5 Handle measurement data 38 3 5 Special hardware characteristics 39 3 5 1 EMCCD camera 39 3 5 2 Spectrometer 40 3 6 Handling part...

Страница 5: ...Freiberg Instruments GmbH Am St Niclas Schacht 13 09599 Freiberg Germany 5 78 5 1 Literature 53 Attachment Radiation source documentation 54...

Страница 6: ...1 Lexsyg Studio link 31 Figure 12 start screen of the application 31 Figure 13 application status 32 Figure 14 menu bar 32 Figure 15 sequence library 36 Figure 16 sequence editor 37 Figure 17 measurem...

Страница 7: ...tion 49 figure 36 schematic of the filterwheel 50 figure 37 opening for changing filters 50 figure 38 location of the loading unloading unit 51 figure 39 removing the loading unloading unit 51 figure...

Страница 8: ...d modification of the equipment this declaration loses its validity 1 1 2 Target Audience The manual is written for the operating personal of the lexsyg luminexcence excitation system for geological a...

Страница 9: ...tract of delivery and the usage with missing or damaged safety installations is prohibited 1 1 5 Safety Installations The following arrangements serve the security of the operating personal electrical...

Страница 10: ...ent of the system Don t expose any body parts e g eyes arms to the radiation This will lead to irreversible damages All works at this partition of the equipment should only be carried out by members o...

Страница 11: ...ple materials on the intended position Warning notice Defiance can lead to mechanical damages of samples and equipment 1 2 4 Control of the Operating Status Keep an eye on the operating status It s di...

Страница 12: ...ints should be periodically checked DIN EN 0105 DIN EN 0702 BGV A2 1 2 8 Mechanics Inappropriate operation can cause damage of property and injuries Use the equipment only for compulsory measuring Ext...

Страница 13: ...ing radiation stimulation i e TL OSL IRSL and RL especially in luminescence dating geo archaeochronometry mineralogical research solid state dosimetry radiation control and material sciences A basic m...

Страница 14: ...ported by a pneumatic handling system from the storage position to the measurement chamber On top of the measurement chamber several excitation devices and detectors are arranged in a modular way to a...

Страница 15: ...n be loaded at the same time by using the loading lid Figure 4 Samples can be exchanged at almost any time during the measurement procedure Measurement sequence selection has to be done by operation s...

Страница 16: ...utomation companies with mean times between failures of several hundred thousand cycles Valves can be found at the left side of the tool in the installation section Electronics Two electronic departme...

Страница 17: ...display for load unload sequence and status information 1x TL OSL measurements 1x Beta irradiation RF measurements 1x additional measurement position module 1 2 1 3 1x additional irradiation position...

Страница 18: ...ive inbuilt radioactive sources to irradiate samples for TL OSL etc and for RF measurements Radioisotope Sr 90 activity 1 8 GBq dose rate ca 0 08 0 1 Gy s high homogeneity of dose rate distribution at...

Страница 19: ...ts elevated temperature RL Measurements are possible during any part of a heating cooling cycle which may simply be a heating ramp but also consist of a series of different steps An extended software...

Страница 20: ...each laser also together with heater light detectors are software protected if automatically filter changer are in use Figure 7 OSL irradiation unit Each laser is separated into eight fibres Seven for...

Страница 21: ...e cathode PMT Electron Tubes 9235Q sensitivity 160 630 nm peak sensitivity 30 quantum efficiency at 200 nm and 350 nm dark counts typ 300 cps photon counter counting linearity random pulses 10 loss mu...

Страница 22: ...ter UV NIR optics 2 1 7 Module 5 2 1 EMCCD Unit The lexsyg can adapt light detectors based on charged coupled devices CCD EM electron multiplying technology CCD cameras have a very high sensitivity wh...

Страница 23: ...C 70 C guaranteed for life thermostatic precision 0 05 C Important requires 6 2 1 lexsyg measurement chamber 1 3 recommended 2 1 8 Modules 6 There is a wide variety of detection windows for different...

Страница 24: ...the optical path optimized filter sets for all main quartz and feldspar minerals luminescence emissions and such for other materials applications are available filter sets interference colour glass op...

Страница 25: ...L analyses in dating and other applications optics designed for high efficiency PMT luminescence measurements 1measurement function of 6 1 2 is included more information on request malfunctions PMT da...

Страница 26: ...are adaption malfunction detector damage software protected 2 1 13 Module 6 2 2 Imaging optics adaption filter changing unit for RF measurement position The lexsyg can adapt imaging light detectors ba...

Страница 27: ...easurement sequence any time special optics for highly uniform irradiation power at the sample other colours on request additional power LED array heads 7 1 x can be ordered and changed manually 2 1 1...

Страница 28: ...ort 1 Open the cover and place the tool on a suitable lab table 2 Install the detectors 3 Connect the main supply needs pressure electricity and vacuum optional 2 3 Operation Make sure the power cord...

Страница 29: ...St Niclas Schacht 13 09599 Freiberg Germany 29 78 2 4 Construction Drawing Figure 9 figure technical drawings see enlarged version at the end of the document Dimension 71 6 x 103 1 x 85 1 cm Weight 90...

Страница 30: ...data sheet for detailed laser safety specifications Warning Never open laser safety installations Whenever opening any mechanical door in the installation or excitation detection section disconnect f...

Страница 31: ...application can be started by clicking the lexsyg Studio link see Figure 11 on the desktop screen of the PC 3 2 Overview Figure 12 start screen of the application After clicking the Lexsyg Studio link...

Страница 32: ...system is in standby mode Further information on these elements is given in section 3 3 and 3 4 3 2 2 Menu bar The menu bar allows access to different software functions In the Analysis menu complete...

Страница 33: ...ing a running measurement see Figure 17 3 2 5 First aid The First aid button provides access to a number of functions not needed in normal work flow They are descripted in section 3 6 3 2 6 Main windo...

Страница 34: ...or to red and in the Application status button the caption switches to resetting and initializing After the initialization the button changes its color back to grey and the connection button is labele...

Страница 35: ...press the sample wheel forward reverse buttons see Figure 2 until the required slot is in front Now it is possible to add or remove the sample disc to or from the slot After this the new status of the...

Страница 36: ...listed in the right list The list on the left side contains all steps added to the sequence in the order of processing Clicking on a sequence step in the add sequence step list opens an edit window wh...

Страница 37: ...le list Editing a linked sequence also changes the flow of all linked samples as long as they are not currently processed So editing a linked sequence should be done with care 3 4 4 Starting a measure...

Страница 38: ...shown When all assigned measurements are finished the system will go back in standby mode indicated by the caption of the measurement button which changes back to start measurement With selecting the...

Страница 39: ...ptional components which can t be controlled only by the sequence editor This section describes the using of these components 3 5 1 EMCCD camera The EMCCD camera is basically controlled by its proprie...

Страница 40: ...amera must be warmed up in a controlled manner button warm CCD to safe temperature and turn off before it will be deactivated It is absolutely necessary to warm the spectrometer up before deactivating...

Страница 41: ...g Instruments Figure 21 options menu 3 6 2 Editing cooling power and evacuation time In some particular cases it is necessary to change the power of the cooling air flow or the duration of evacuation...

Страница 42: ...slot in the sample wheel and open the First aid menu Figure 22 If there is still a sample disc is in the grabber and not on the sample arm or vice versa check the radio buttons sample on arm or sample...

Страница 43: ...e disc remains lost it is necessary to open the chamber manually and find the disc before proceeding with the measurement Otherwise it is possible to damage the measurement system Warning After each o...

Страница 44: ...al mandatory intervals Avoid exposing the equipment to heat dirt and other environmental influences This will elongate the lifetime of the equipment 4 1 1 Checking the system pressures To check the di...

Страница 45: ...e you can fill the chamber with nitrogen by software It is recommended to switch of the system before lifting the measurement chamber Figure 25 measurement chamber screws The measurement chamber can b...

Страница 46: ...ment chamber and the ground plate Use this gap and a thin brush or vacuum cleaner to clean the chamber Warning Be careful and don t damage the sample arm inside the chamber The arm can be moved by han...

Страница 47: ...have to be cleaned regularly because heating and silicon oil can cause dust on it Cleaning at the OSL position First remove all plugs behind the OSL position see Figure 28 Figure 28 plugs of the OSL u...

Страница 48: ...elow the window and into the window frame Cleaning at the extra TL position optional First remove the plug and the air tube backside of the filter changing unit on this position For removing the air t...

Страница 49: ...re 34 opening the extra TL position Now you have free access to the detection window You can remove it by opening the tree screws in the frame to clean or replace it Mounting works in reverse directio...

Страница 50: ...nside figure 35 schematic of the filterwheel Attention The Number that is selected means always the filter in the light beam That means that the changed filter has an offset of 3 positions to the show...

Страница 51: ...37 location of the loading unloading unit Open the screws and move the cap up figure 38 removing the loading unloading unit Give attention on the right position of the gasket if you close the cap 4 1...

Страница 52: ...vedmaintenance panelwith visibleheater unit Then the arm can be moved up carefully and a new one can be mounted in reverse direction 4 2 Spare parts Spare parts Chamber window glass Gasket for all rem...

Страница 53: ...tze A Dietrich T Trautmann Radiation Measurement Vol 27 No 5 6 pp 695 748 1997 Spectral information from minerals relevant for luminescence dating 2 G Erfurt and M R Krbetschek Ancient TL Vol 21 No 1...

Страница 54: ...ing system lexsyg see fig 1 has been designed for absolute dating of geological and archaeological objects by means of radio fluorescence RF thermo luminescence TL and optically stimulated luminescenc...

Страница 55: ...s Schacht 13 09599 Freiberg Germany 55 78 Fig 1 Basic concept of the measuring system lexsyg Photo multiplier tube CCD camera Radiation source modules Control panel Port for sample loading Fig 2 Measu...

Страница 56: ...er accommodating up to 80 samples During the automatic measuring procedure the individual sample to be analyzed is moved to the appropriate position irradiation luminescence detection etc in the measu...

Страница 57: ...ovides necessary operating and safety features adapter for pressurized air shutter quartz glass window fluorescence light exit connectors for shutter position sensors Transport safety plate beta shiel...

Страница 58: ...fig 6 For sample irradiation typically between one and ten minutes of duration the shutter will be opened by a pneumatic cylinder The actual shutter position will be detected by two non contact sensor...

Страница 59: ...er foil are affixed to each other by means of three special screws see figures 7 and 8 All of the components are made of stainless steel The radiation source provides an absorbed dose rate of 0 1 Gy s...

Страница 60: ...mber see fig 4 The labelling of the source module also provides information on the radiation source installed The housing bears the radiation trefoil symbol Table 1 Technical specifications of the sin...

Страница 61: ...cording to a maximum source activity of 2 0 GBq Conditions were as follows Radiation source Sr 90 Radiation source module with 5 mm lead lined housing installed in lexsyg prototype unit Radiation sour...

Страница 62: ...more than 10 times under certain circumstances such as Wipe test conducted at source shutter Cleaning of the measuring chamber or the sample carrier of the lexsyg Handling of the radiation source mod...

Страница 63: ...tion source module 3 Assembling and adjusting the optical components 4 Test run 5 Closing the lexsyg housing duration 20 min Typical distance to source 30 cm eyes body 10 cm hands Dose per handling 13...

Страница 64: ...nging the window use tweezers or similar tools 7 Assembling the window fixing ring 8 Assembling and adjusting the optical components 9 Test run 10 Closing the lexsyg housing duration 20 min Typical di...

Страница 65: ...ion 5 min Typical distance to source 50 cm eyes body 20 cm hands Dose per handling 0 3 Sv eyes body 3 Sv hands Number of annual activities 40 notes Shutter must be closed Upon opening the measuring ch...

Страница 66: ...g of the radiation source module and lead shield into the lexsyg 7 Assembling and adjusting of the optical components 8 Test run duration 10 min Typical distance to source 30 cm eyes body 5 cm hands D...

Страница 67: ...adjustment and calibration activities 2 2 6 Radiation source leakage test performed by approved expert Process steps 1 Removal of the radiation source module from the lexsyg according to the procedur...

Страница 68: ...usted Process steps 1 Opening of the lexsyg housing 2 Disassembling of the external optical system mounted on top of the radiation source module 3 Removing the lead shield of the radiation source modu...

Страница 69: ...Tab 3 Estimated occupational exposure during work with the lexsyg Person Annual Dose mSv Effective Dose Lens of the Eye Extremities Hand Scientist Operator 0 4 0 4 1 6 Laboratory Technician 0 3 0 3 0...

Страница 70: ...e the shutter is either fully closed or fully open The actual shutter position is monitored by sensors In case of complete failure of electrical power and or pressurized air supply the shutter will a...

Страница 71: ...tion 5 ensure radiation source integrity at any time The radiation source module in particular the shutter mechanism has undergone extensive testing and functional performance verification Anticipatin...

Страница 72: ...is closed Perform radiation survey Remove radiation source module from lexsyg base plate Note that the shutter doesn t shield beta radiation completely Use appropriate radiation safety measures acryli...

Страница 73: ...iclas Schacht 13 09599 Freiberg Germany 73 78 Fixing screws for source Do not unfasten Source window direct wipe test Shutter indirect wipe test Fig 9 Surfaces for the wipe test Shutter in open positi...

Страница 74: ...ing container left and source container with radiation source module right The radiation source module can be easily installed into the lexsyg per instructions provided below and depicted by figures 1...

Страница 75: ...and remove the transport safety plate Use appropriate radiation protection measures acrylic glass shield if available Wear film badge and finger ring dosimeter To minimize exposure always hold the sou...

Страница 76: ...Freiberg Instruments GmbH Am St Niclas Schacht 13 09599 Freiberg Germany 76 78 Fig 12 5 mm lead housing on right to be placed over the radiation source module after installing in the lexsyg main unit...

Страница 77: ...Freiberg Instruments GmbH Am St Niclas Schacht 13 09599 Freiberg Germany 77 78 Attachment 1 Data sheet of beta source Sr0 S03 1 Eckert Ziegler BEBIG GmbH...

Страница 78: ...Freiberg Instruments GmbH Am St Niclas Schacht 13 09599 Freiberg Germany 78 78 Attachment 2 Type A shipping container drawing PZ 0103 001 Eckert Ziegler nuclitec GmbH...

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