icrm rmt working group meeting

ICRMRMT 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

New Projects Volunteers ?

Review of Posters Other Business

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 …

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



DCC Simulation (DCC_SIM) Test software routines at higher count rates than currently

achievable in hardware. TEST ENTIRE SOFTWARE PACKAGES.

Simple Nuclide Single branch ray or conversion electron Constant Decay Rate

Simple “spectral” shapes NOT using “Fermi” theory for spectra Rectangular or triangular shapes

KNOWN activity, extrapolation fit parameters Not realistic, but KNOWN properties ! Quality Assurance of Analysis Code Walk before we run !

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

Simulated Pulse Shapes

Simulated Pulse Shapes

Based on SIMPLIFIED model of shaping amplifier

Pulse Pile Up with clipping to 12 bits

Simulated Decay Timing

Poisson Process (rate = A0)

Exponentially distributed intervals between successive disintegrations.

Summation of all previous intervals yields decay “time”.

Simulated Pulse Timing

Time of decay modified addition of

Constant Delay Random Time Jitter

time distribution (TAC)

Detection Efficiencies

Summing of contributions in channel : (only 1 count)

Computer Discrimination

Survival of Beta Spectral ComponentsRectangular Spectrum : f (z) = 1/NRectangular Spectrum : f (z) = 1/N

Survival of Beta Spectral ComponentsRectangular Spectrum : f(z) = 1/NTriangular Spectrum : f(z) = 2z/N 2

Survival of Beta Spectral ComponentsTriangular Spectrum : f (z) = 2(N - z)/N 2 Rectangular Spectrum : f (z) = 1/N

Survival of Beta Spectral ComponentsTriangular Spectrum : f (z) = 2(N - z)/N 2 Triangular Spectrum : f (z) = 2z/N 2

Example Simulation: Triangular and spectra

Example Simulation

Simulation Parameters

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.

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



icrm rmt working group meeting

Documents