Construction and implementation of a TDCR system at ENEA

• Electronics component and optical chamber of new ENEA-INMRI home-made TDCR detector.
• CAEN Desktop Digitizer DT5720 and Control Software DPP-CI with the new TDCR device.
• Test of the TDCR off-line analysis data by customized CAEN and ENEA-INMRI software.
• Birks constants, kB, effects on 3H activity measurements with the new TDCR device.
• Birks constants, kB, effects on 63Ni activity measurements with the new TDCR device.

A new 4π (LS) TDCR system was built at ENEA-INMRI. Three photomultiplier tubes, arranged in a planar 120° geometry around a spherical optical chamber, were directly linked to a CAEN Desktop Digitizer DT5720. This module, based on the Field Programmable Gate Array (FPGA) technology for real time Digital Pulse Processing (DPP), allowed to replace all the classical TDCR electronics by only one device. The activity of 3H and 63Ni standard sources were successfully measured by the new detector.