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ICRM RMT Working Group Meeting

ICRM RMT Working Group Meeting. John Keightley Mike Unterweger. Agenda. LIST OF MEMBERS DCC Data Simulation (DCC_SIM) New RMT website to act as a repository for DCC data sets Tritium Comparisons Large Area Reference Sources Half Life Measurements Future of RMT Working Group

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ICRM RMT Working Group Meeting

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  1. ICRMRMT Working Group Meeting John Keightley Mike Unterweger

  2. Agenda • LIST OF MEMBERS • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  3. Members : Areas of Interest • Broad Range of Topics • Coincidence Counting • Monte Carlo Modelling • New Detector Systems/Techniques • Bolometry (LNHB) • Digital Data Acquisition for Coincidence Counting • Comparisons • Large Area Source measurements • Tritium Comparisons • …

  4. Agenda • LIST OF MEMBERS • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  5. DCC Simulation (DCC_SIM) • Test software routines at higher count rates than currently achievable in hardware. TEST ENTIRE SOFTWARE PACKAGES. • Simple Nuclide • Single b branch • g ray or conversion electron • Constant Decay Rate • Simple “spectral” shapes • NOT using “Fermi” theory for b spectra • Rectangular or triangular shapes • KNOWN activity, extrapolation fit parameters • Not realistic, but KNOWN properties ! • Quality Assurance of Analysis Code • Walk before we run !

  6. DCC Simulation Program (“DCC_SIM”)Simplified list of Model Inputs

  7. Simulated Pulse Shapes

  8. Simulated Pulse Shapes Based on SIMPLIFIED model of shaping amplifier Pulse Pile Up with clipping to 12 bits

  9. Simulated Decay Timing • Poisson Process (rate = A0) • Exponentially distributed intervals between successive disintegrations. • Summation of all previous intervals yields decay “time”.

  10. Simulated Pulse Timing • Time of decay modified • addition of • Constant Delay • Random Time Jitter b-g time distribution (TAC)

  11. Detection Efficiencies Summing of contributions in b channel : (only 1 count)

  12. Computer Discrimination

  13. Survival of Beta Spectral ComponentsRectangular b Spectrum : fb (z) = 1/NRectangular g Spectrum : fg (z) = 1/N

  14. Survival of Beta Spectral ComponentsRectangular b Spectrum : fb (z) = 1/NTriangular g Spectrum : fg (z) = 2z/N 2

  15. Survival of Beta Spectral ComponentsTriangular b Spectrum : fb (z) = 2(N - z)/N 2Rectangular g Spectrum : fg (z) = 1/N

  16. Survival of Beta Spectral ComponentsTriangular b Spectrum : fb (z) = 2(N - z)/N 2Triangular g Spectrum : fg (z) = 2z/N 2

  17. Example Simulation: Triangular b and g spectra

  18. Example Simulation Simulation Parameters

  19. Recommendations • Use my simulation program in a series of tests on various software routines from different NMIs. • DATA SWAPPING • Problems with e-mail (large data sets) • > 10 Mbytes per file • Zip Files are blocked by Mail Servers • Propose web site for download/upload of data • NPL to host ?? • Combine with “proper” Monte Carlo simulations for realistic case/s.

  20. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  21. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  22. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  23. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  24. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

  25. Agenda • DCC Data Simulation (DCC_SIM) • New RMT website to act as a repository for DCC data sets • Tritium Comparisons • Large Area Reference Sources • Half Life Measurements • Future of RMT Working Group • New Projects • Volunteers ? • Review of Posters • Other Business

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