poster - Università di Pisa

TAWARA_RTM – The Detection System for Real Time Monitoring
SCINTILLATORS
FOR
HIGH
TEMPERATURE
PLASMA
DIAGNOSTICS
of Radioactive Contamination in Water Processed at Water Treatment Facilities
L. Swiderski, A. Gojska, M. Grodzicka, S. Korolczuk, S. Mianowski, M. Moszynski, J. Rzadkiewicz, P. Sibczynski,
M. Lunardon1, D. Badocco2, T. Batsch3, E. Bodewits4, R. Brugera1, P. Carconi5, D. Cester1, P. De Felice5, M. Donati6, L. Fanucci6, A. Fazio5, D. Filippi1, C. Fontana1,
A.
Syntfeld-Kazuch,
M.
Szawlowski,
T.
Szczesniak,
A.
Szydlowski,
1
7
7
3
8
1 J. Szewinski,
1
3
9I. Zychor9
9
A. Garfagnini , P. Garosi , A. Iovene , J. Iwanowska-Hanke , B. Kuraś , G. Mistura , S. Moretto , M. Moszyński , I. Obierak , A. Olejnik , M. Parol-Wiski ,
2
5
1
2
6
4
1
3
2
7
1†
P. Pastore , A. Petrucci , M. Pierno
, F. Romanini
, A.Nuclear
Ruiu , P.Research
Schotanus(NCBJ),
, L. Stevanato
, L.
Swiderski
, A. Tapparo , C. Tintori , G. Viesti
National
Centre for
05-400
Otwock,
Poland
1)
Universita di Padova, Dipartimento di Fisica e Astronomia, Via Marzolo 8, I-35131 Padova, Italy
2)
Universita di Padova, Dipartimento di Scienze Chimiche, Via Marzolo 1, I-35131 Padova, Italy
3)
National Centre for Nuclear Research (NCBJ), 05-400 Otwock, Poland
4)
Scionix Holland B.V., Regulierenring 5, 3981 LA Bunnik, The Netherlands
5)
6)
ENEA, National Institute of Ionizing Radiation Metrology, C.R. Casaccia, 00123 Roma, Italy
University of Pisa, Department of Information Engineering, via G. Caruso 16, 56121 Pisa, Italy
7)
8)
CAEN SpA, Via della Vetraia 11, I-55049 Viareggio, Italy
Wardynski & Partners, Al. Ujazdowskie 10, 00-478, Warsaw, Poland
9)
MPWiK SA, Pl. Starynkiewicza 5, 02-015 Warsaw, Poland
Abstract
In this presentation we report on the construction and performance of a detection system designed and built within the
TAp WAter RAdioactivity Real Time Monitor (TAWARA_RTM) project. The aim of the TAWARA_RTM project is to provide a platform that allows for continuous inspection of water processed at water treatment sites and enables instant reaction upon detected radiological threat. The TAWARA_RTM platform is a three-device inspection system comprising an Early Alarm Detector
(EAD), a Real Time Monitor (RTM) and a Spectroscopy Detector (SPEC). The EAD is placed close to the water intake to shut off
the water flux to further stages of the water treatment facility in case a substantial amount of gamma-ray emitters appear in the
water. The RTM is a detection system for continuous monitoring of gross alpha and beta radioactivity in the processed water.
The RTM is placed at the end of the treatment and purification process, just before the distribution. In case the RTM detects that
the alpha and/or beta count rate exceeds the background level, an alarm is set and the water from the RTM device is pumped into the SPEC. The SPEC aims at identifying the radioisotopes detected by RTM using gamma-ray spectroscopy. To reduce the
measurement time, a concentrator based on selective ion-exchange resins is used. In addition, a dedicated ICT infrastructure
has been developed to operate the system and manage the alarms that may occur during operation.
The TAWARA_RTM platform
 Early Alarm Detector (EAD)
Scans water after first step treatment – sedimentation. Aimed
at detection of large contamination at the intake point.
 Real Time Monitor (RTM)
First-line system for on-line detection of alpha and beta emitters in water.
 Spectroscopy Detector (SPEC)
Second-line system for identifying gamma-ray emitters in
case of an alarm raised by the RTM.
 ICT Infrastructure
Allows to control the operated devices, to collect data from
the diagnostic systems and to manage the alarms.
Early Alarm Detector (EAD)
Real Time Monitor (RTM)
 3"×3" NaI:Tl mounted in ~9 L cylindrical vessel.
 24 pcs. of EJ444 sheets (EJ212 plastic scintillator covered
with EJ440 powder containing ZnS:Ag), each readout by
two R3550 PMTs.
 25 mm thick lead shield for background reduction.
 ~50 L/h of raw water flow.
 CAEN Gammastream fully integrated digital MCA
for on-line charge integration in NaI:Tl detectors.
Results of calibration tests at ENEA
 RTM detection efficiency
 5 mm (bottom) and 2 mm (top and sides) thick lead shield
for background reduction.
 CAEN V1730 digitizers for on-line processing algorithm for
pulse shape discrimination.
10 counting intervals, each 240 s duration.
 SPEC detection efficiency
Spectroscopy Detector (SPEC)
ICT Infrastructure
 3"×3" CeBr3 scintillator coupled to R6233 PMT.
 Connects all monitoring nodes installed along the
Waterwork Plant with the Central Server (CS) installed
in a control room.
 200 mm long and 28 mm thick BGO anti-Compton
shield.
 50 mm thick lead shield for background reduction.
 Epoxy resin filled ion-exchange concentrator (IECS)
for increasing gamma-rays counting rate.
 CAEN DT5780 two channel digital MCA for on-line
pulse height analysis in Compton-suppressed mode.
 Allows remote and local operators to manage the
TAWARA_RTM system using web-based Graphical
User Interfaces.
 Provides secure and lossless data communication
(aggregate data, alarms, commands) using TCP/IP
connections over Ethernet or 3G technology.
Sources distributed inside a ring, each measurement 1800 s long.
Conclusions
 The TAWARA_RTM platform has been designed, developed
and installed in Waterworks Plant.
 The RTM detector sensitivity is at the level of 0.01 cps/Bq
for alpha particles and 0.4-1.1 cps/Bq for beta particles.
 The SPEC allows for identification of <1 Bq within 1 h.
 The sensitivity tests with the ROCS will be carried out
during next weeks in the MPWiK North Waterworks Plant
in Wieliszew.
Acknowledgement
This work was partly supported by the project „TAp WAter RAdioactivity Real
Time Monitor” funded by the EU FP7 Security Programme under grant agreement
no. 312713 and by the Polish funds for science for 2014-2016 allocated to cofunded international projects – contract 3036/7.PR/2014/2 .
2E-15
www.tawara-rtm.eu
www.ncbj.gov.pl
[email protected]