ICRM : RMT Working Group
RMT Working Group (RMT – WG) re-instated following ICRM 2001
Loss of Many “experts” in the field over the last years VERMI Workshops
RMT Sessions have continued at ICRM 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 …
RMT Working Group
In my opinion, this range of topics is too large for RMT Working Group Coordinators to keep control or make valuable input …
3 major tasks assigned to Working Group Digital Coincidence Counting (DCC) Data Conversions and
comparisons (John Keightley) DCC data set Simulations (John Keightley) Tritium Comparisons (Mike Unterweger)
Does not reflect full range of topics covered Volunteers for other areas ? (Please !) Discuss in Working Group Meeting
Digital Coincidence Counting Data Format Conversions
Conversion routines written as 32 bit DLLs in Visual C++
Only recently finished DCC – CMI conversion (last week)
DCC Comparisons
Each system uses different data format and independent analysis software
HOWEVER : WE SHOULD ALL GET SAME RESULTS FOR MEASURED ACTIVITY Same input data sets
Initial Tests with data from 56Mn source NOT to be published … First attempt at data conversions looks
promising
VNIIFTRI
Pulse Time and Height
(no shape data)
10 s non extending dead time inherent in digitisation process
10 bit ADCs
KRISS
Pulse Time and Height (12 bit)
(no shape data)
8 s non extending dead time inherent in digitisation process
28 bit clock at 100 MSPS
Preliminary Results : 56MnKRISS and DCC (Computer Discrimination) Gamma Gate : Channels 861 – 1004 (12 bit scale) Coincidence Resolving Time : 1.5 s per channel CMI (Computer Discrimination) Gamma Gate : Channels 53 – 63 (on 8 bit scale) Coincidence Resolving Time : 1.68 s per channel VNIIFTRI I need more info !! Beta Efficiency Range
High% Low %
Extrapolated Activity (kBq)
KRISS DCC CMI VNIIFTRI 95.6 86.8 3.24 3.36 3.36 ? 95.6 82.4 3.33 3.36 ? 95.6 77.0 3.40 3.36 3.36 ?