Comunicazione

# Compact and multi-channel readout system for the long term radioactive waste monitoring.

##### Poma G.E., Cosentino L., Fanchini E., Finocchiaro P., Garosi P., Longhitano F., Lucchesi A., Ninci D., Simonetto M., Tintori C.
Martedì 13/09   09:00 - 13:30   Aula L - Christa Mc Auliffe   VI - Fisica applicata, acceleratori e beni culturali
We developed gamma-ray counters (SciFi) and solid-state thermal neutron detectors (SiLiF) as a solution for radioactive waste monitoring. SciFi is a low-cost Geiger counter and consists of scintillating fiber coupled to two silicon photomultipliers (SiPM): thanks to its optimized single-photon sensitivity and left-right coincidence constraint, SciFi can be employed for long-term monitoring. SiLiF detector consists of polyethylene $103 {cm^{3}}$ hollow cube for neutrons thermalization, and double-sided silicon diode placed at its center, sandwiched between two $^{6}LiF$ converter layers: by means of $n+\,$ ^$6$Li\rightarrow \, ^$3$H(2.73 $MeV$)+\, ^$4$He(2.05 ${MeV})$ reaction, we can count the $^{3}H$ and alpha contributions and reconstruct their energy spectra. In order to obtain a compact optimized data acquisition system, a 64-channel digitizer coupled with power supply, and new CAEN Front-End board with dedicated software have been employed for neutron and gamma detection, respectively. By using $\gamma /{n}$ sources, several tests have been carried out in laboratory environments by means of activity known point-like sources and radwaste drums with undefined compositions and activity distributions. Preliminary results will be presented.