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Flexibility in Luminescence Dating

Flexibility in Luminescence Dating. Victor J. Bortolot Daybreak Nuclear and Medical Systems, Inc. Andrzej Bluszcz Silesian Technical University. Long Ago Days. Simple, canned methods used by virtually everyone Basic instrumentation served for all methods

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Flexibility in Luminescence Dating

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  1. Flexibility in Luminescence Dating Victor J. Bortolot Daybreak Nuclear and Medical Systems, Inc. Andrzej Bluszcz Silesian Technical University Flexibilty...

  2. Long Ago Days • Simple, canned methods used by virtually everyone • Basic instrumentation served for all methods • Data largely held as paper files of ED calculations and plots of curves Flexibilty...

  3. Now, Luminescence Dating is a Bit Chaotic • The older methods are replaced by ad hoc fixes as difficulties arise • These may change almost daily • Every new bit of hardware is the magic bullet, soon to be supplanted by the next new bit at great expense • Expansion capabilities limited • Data is disorganized and not easily transferable between laboratories Flexibilty...

  4. Some Solutions • Flexible scripting language • Schema files define data formats • File translator • XML-compliant tags implement database • Back to modularity in instrumentation Flexibilty...

  5. Scripting Language • Take data by algorithm • Avoid tedious set up and program entry errors • Scalable • Worksheets with check-off boxes prevent confusion Flexibilty...

  6. Parts of a Script • Global declarations of system settings, declaration of lists of disks, irradiations, etc. • Sequences of operations • Running of sequences and looping through lists Data taking runs directly from lists Flexibilty...

  7. METHOD TEMPLATE "TL slide“ (1 of 3)  GLOBAL RampRate = 10 EndTemp = 500 CoolTemp = 60 HoldTime = 0 PreTemp = 200 PreTime = 20 IrradSource = 3 IrradTemp = 30 IrradPos = 1 NIrrSource = 3 NIrrTemp = 30 NIrrPos = 1 NIrrTime = 1 NPreTemp = 200 NPreTime = 20 BlchDev = 1 BlchInt = 1 BlchTemp = 30 ED = 150 LIST Add = (0#8, 0.33*ED#5, 0.67*ED#5, ED#4, 1.33*ED#4) LIST Reg = (0#3, 0.33*ED#5, 0.67*ED#5, 1.33*ED#5, 2.0*ED#4, 2.67*ED#4) LIST BlchTime = (180, 360) END GLOBAL Flexibilty...

  8. (2 of 3)  SEQUENCE Sequence0 = ( PREHEAT(RampRate, PreTemp, PreTime, CoolTemp), TL(RampRate, 0, 0, EndTemp, HoldTime, CoolTemp), TLBGD(RampRate, EndTemp, CoolTemp), IRRAD(NIrrSource, NIrrPos, NIrrTemp, NIrrTime), PREHEAT(RampRate, PreTemp, PreTime, CoolTemp), NORM TL(RampRate, 0, 0, EndTemp, HoldTime, CoolTemp), NORM TLBGD(RampRate, EndTemp, CoolTemp) ) Sequence1 = ( IRRAD(IrradSource, IrradPos, IrradTemp, &Add), Sequence0 ) Sequence2 = ( BLEACH(BlchDev, BlchInt, BlchTemp, &BlchTime), IRRAD(IrradSource, IrradPos, IrradTemp, &Reg), Sequence0 ) END SEQUENCE Flexibilty...

  9. (3 of 3) METHOD MULTIPLE_ALIQUOT OPEN "script04" LOOP Add LOOP DISKS Sequence1 END LOOP END LOOP LOOP BlchTime LOOP Reg LOOP DISKS Sequence2 END LOOP END LOOP END LOOP END METHOD Flexibilty...

  10. Future Directions for Scripts • Conditionals • Control of arbitrary instrumentation (e.g., through Computerboards, Inc. Universal Driver) Flexibilty...

  11. Schema Files Define Format • Similar to database specification but separate from data files • Adaptable to binary and ASCII formats • Easily expandable to accommodate new fields Flexibilty...

  12. Example of Use • FirstLight Editor/Analysis completely configurable, obtains field definitions, ID, and labels and window layout from schema file • Format of edit window user-alterable and stored in schema • Finally ready for release in December Flexibilty...

  13. Inter-Laboratory Data Exchange • Many different data formats are in use with a variety of incompatible analysis programs • File translator needed to ensure a wider audience for good software • We hope to encourage people writing software to include enough data in their file formats to make transfer of data feasible without too much editing (adding missing fields, etc.) Flexibilty...

  14. File Translation • Requires file format and specification of variables (especially scalar variables), and flagging of non-essential--instrument related--quantities • Requires correspondence of each variable to an entry in a master glossary • Requires schema files for the input and output formats Flexibilty...

  15. Freeware Translator/Editor Project • Translation to and from Daybreak and Riso (Geoff Duller’s binary) formats, and others • Easy alteration of variables to fill in blank fields or correct errors • Display of curves • Conversion to ASCII for input to spreadsheets • Ready for Reno meeting (hopefully) Flexibilty...

  16. Easy Progression to XML • Schema files convert easily to XML tags for binary data • ASCII XML documents are human-readable • Many tools available now for database functions (tree search, SQL-like queries) • Graphics, other documents can be encapsulated with hierarchical information Flexibilty...

  17. A Basic Requirement… • For ease of sharing data a common set of basic tags (variable definitions) should be adopted • Software should declare what variables are necessary, and perhaps have a validator to ensure no essential data is missing from a file format Flexibilty...

  18. A Proposed Database Hierarchy • Top (laboratory-wide) level with instrumentation database, tag definitions, protocol scripts,etc. • Project level • Sample level All XML documents to encapsulate a pointer to the level above, can be password-protected and read-only for security Flexibilty...

  19. An Example of Modularity • Daybreak 2200 OSL reader has 60 sample changer on removable platter as the basic building block • Three stations for measurement, irradiation, bleach, etc. • Each station takes a sample elevator below (heated or unheated, three different types, three different elevator heights) and a variety devices above Flexibilty...

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  24. Modularity, continued • Variety of detectors—singles and multiple—up to 32 photon counters supported • Variety of OSL exciters---LED, fiber optic, laser scanned single grain • Bleach lamp—solid state white or halogen • Electronics contained in a single replaceable drawer for easy future upgrades Flexibilty...

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  27. Future Directions • Serial bus to support 16 distributed devices—heater/elevators, light source controllers, counters • Extension to evacuated systems (already designed) • Entire lab made a network (irradiators, alpha counters, etc. Flexibilty...

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