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  ENVIRONMENTAL GAMMA RADIATION MONITORING UNIT

ENVIRONMENTAL GAMMA RADIATION MONITORING UNIT

NAUSICAA 5301 IC series

MAIN FEATURES

• Detector: pressurized ion chamber
• Measurement range: 10 nSv/h ÷ 100 mSv/h  (pulsed field version) or 10 nSv/h ÷ 10 Sv/h (environmental measurement version)
• Energy range: 80 keV ÷ 10 MeV, extendable to 35 keV ÷ 10 MeV (with ICP-T detector)
• Local display of acquired data and alarm status
• Connectable to a Host PC (optional) through serial cable (even RS485/422 for long distances), Ethernet, or wireless (upon request)
• Software for archives storage available on the host PC
• Software for remote management and data visualization available upon request
 

DESCRIPTION

The NAUSICAA 5301 IC environmental monitoring unit is a modular system for gamma dose measurements, and it comes in two versions: with an electrometer for pulsed field measurements (7 decades, 5301 IC-PF) or with an electrometer for environmental measurements (9 decades, 5301 IC, default version). The detector is a 16-atm ion chamber of the ICP series, which allows to extend the detection energy range down to the low energies (35 keV), by choosing the proper model.
The instrument is composed by the following main parts:
• Ion chamber detector;
• Power supply and signal processing electronics
• Acquisition and control unit
The acquisition and control unit elaborates and visualizes the data coming from the detection group, composed by the ion chamber and the connected electronics.
The unit allows to visualize locally the dose rate or the integrated dose values and eventually indicates alarm, pre-alarm or bad functioning statuses through acoustic and luminous signals.
The threshold values for alarm and pre-alarm statuses, and the operational parameters, which are saved in the internal memory, can be set by the operator through the external keyboard or through the remote management software (optional).
The standard configuration of NAUSICAA monitoring unit, suitable for indoor use, is composed by a table box 3U 63HP, which hosts the electronics modules, and the ion chamber directly installed on top of it. Wall mounting accessories are also available, as well as a high-protection IP65 container for outdoor use. It is possible to connect the acquisition unit to a host PC through a serial communication, up to a 10 m distance, or RS485/422 interface, for longer connections (up to 1 km). An Ethernet connection is also available, and upon request a wireless communication module can be provided.
The optional host PC includes the software for archive storage, which allows to save in the memory the monitoring data and to visualize them on the PC. Alternatively the 5700 sMON software can be installed, which allows a complete remote management of the monitoring unit.
 

TECHNICAL SPECIFICATIONS

• Temperature range: 0  40 °C
• Weight: 20 kg with ICP; 17 kg with ICP-T 
• Dimensions W x D x H: 365 x 390 x 560 mm

Measurement features

• Measurement range: o 10 nSv/h ÷ 10 Sv/h (environmental measurement version)  
o 10 nSv/h ÷ 100 mSv/h (pulsed field version) 
• Energy range: o 80 keV ÷ 10 MeV (Mod ICP); 35 keV ÷ 10 MeV (Mod. ICP-T) 
• Energy response: ± 20% from 80 keV to 120 keV; ± 5% from 120 keV to 2 MeV 
• Accuracy: ± 5% at environmental background radiation levels

Detection unit

• High pressure ion chamber, filling gas: Argon 6.4 atm + Nitrogen 9.6 atm

Power supply and processing electronics

Two alternative electrometers, one for pulsed fields (7 decades) and one for environmental measurements (9 decades):
• Pulsed field electrometer (tested in Trieste at the ELETTRA synchrotron under the following  conditions: 70 ns pulse length, 10 Hz repetition frequency, number of pulses: 1, 2, 10 with Linac  currents 1, 2, 5, 10 and 15 mA, see “Development and experimental performance evaluation of  a dose-rate meter for pulsed beam, in Proceedings of the RADSYNCH 2009, 65-70”):  o 7 decades with automatic scale change
o Single pulse detection up to 3,5 nC/pulse ~ 4,3 Gy/pulse 
• Environmental measurements electrometer:
o 9 decades with automatic scale change
• Digital setting of calibration parameters
• Low-noise HV circuit: 0  1,3 kV digital control

Acquisition and control unit

• Dose rate measurements: instantaneous (Sv/h), 1 minute average and 1 minute maximum 
• Integrated dose: referred to 1 hour, 24 hours and total
• LCD display 2x16 characters with LED and siren for alarm, pre-alarm and good functioning 
• Real time clock circuit
• Watchdog circuit for functioning control
• Interfaces: RS232; RS485/422 for long distances; Ethernet 10/100; wireless (upon request) 
• Memory: E2PROM for parameters, DataFlash for measurements

Electrical characteristics

• Power supply: 230 Vac 50 Hz; 60 W (typical value)

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