Development and Experimental Performance Evaluation of a Dose-Rate meter for Pulsed Beam.

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1 5 th International Workshop on Radiation Safety at Synchrotron Radiation Sources Development and Experimental Performance Evaluation of a Dose-Rate meter for Pulsed Beam. A. Vascotto 1, K. Casarin 1, S. Sbarra 1, M. Ballerini 2, G. Merlino 2 1 Sincrotrone Trieste S.C.p.A. Strada Statale S.S.14 km 163.5, Basovizza, Trieste, Italy 2 Else s.r.l., Via Pier della Francesca 26, Trezzano sul Naviglio, Milano, Italy TRIESTE, 22 May 2009 RADSYNCH

2 Contents Preliminary Study Silena Gamma Radiation Monitor Experimental front-end electronics Development of a new front-end electronics Requirements Measurement Technique Testing Results Pulsed beam response Long term stability Conclusions TRIESTE, 22 May 2009 RADSYNCH

3 ION CHAMBER HV POWER SUPPLY + - RATEMETER CPU BOARD I/O BOARD Environmental Gamma Radiation Monitoring System Silena Gamma Radiation Monitor: High pressure Ion Chamber Detector mod. Centronic IGC5/A6.4 N9.6 High voltage power supply 6 decades linear amplifier Auto-ranging & A/D Converter Digital Rate-meter & Relay I/O Boards LINEAR AMPLIFIER C2 AUTO-RANGING & ADC C1 SW1 R1 PGA SW3 C3 DATA OUT[1..12] ADC uc SW2 SWITCHED INTEGRATOR PROGRAMMABLE GAIN AMPLIFIER SAMPLE & HOLD TRIESTE, 22 May 2009 RADSYNCH

4 Performance of the Silena Gamma Radiation Monitor. stable radiation levels or continuous pulsed radiation field Good accuracy and linearity Excellent long term stability at natural background radiation levels. fast and wide fluctuations of the radiation levels or short time, intermittent high intensity pulsed radiation field Good accuracy and linearity within the first 3 decades (max dose value of 250nGy for 1s fixed integration time) First stage saturation and wrong selection of gain amplifier over the 3rd decade when full scale change is required, because of different dose values An experimental acquisition system was design. TRIESTE, 22 May 2009 RADSYNCH

5 + - Experimental front-end electronics Main features Output voltage signal of the amplifier proportional to the charge accumulated within the integration time. Remote control of the integration time. Options available: 100µsec, 1ms, 10ms, 100ms, 1s. No loss of the charges generated by the detector and continuous integration of the input signal. HIGH VOLTAGE C2 INTEGRATION TIME INTERVAL TRIGGER ION CHAMBER SW2 SW1 CLOSED OPEN IG5 C1 SW1 ADC SW2 START CONV CLOSED OPEN ON OFF VC1 0V DATA OUT[1..14] VOUT 0V TRIESTE, 22 May 2009 RADSYNCH

6 ADC Ouput Code ADC Ouput Code Preliminary test in high energy pulsed radiation field Objectives Study the response of the front-end experimental acquisition system Define the requirements for the new front-end electronics Data at 2mA 10Hz (Integration Time ~1ms) Data at 10mA 10Hz (Integration Time ~1ms) Time [ms] Time [ms] Linac beam operating at 900 MeV with 70 nsec pulse duration Different electronic set-up of the experimental acquisition system was evaluated TRIESTE, 22 May 2009 RADSYNCH

7 New front-end electronics development Main Requirements Good accuracy and long term stability with very low input current (10-14 A) at natural background radiation level Capability to process high number of charges within a very short time interval (up to100nc in 1ms) Fast time response (<2ms) Good linearity within 7 decades dynamic range up to 10-7 A (high radiation dose rate) Hardware & Software compatible with existing Silena Gamma Monitor (modular electronic board level) TRIESTE, 22 May 2009 RADSYNCH

8 + - Measurement Technique Operation mode Charge transferred to capacitor C2 every 1ms by SW1 (integration time) Charge in C2 reset every 1ms or hold by SW2, depending on output voltage level X1 and X10 output signal cyclically sampled by the ADC Dose rate, as the sum of 1000 individual integrated values, calculated every 1 s by the u-controller, taking into account the conversion factor HIGH VOLTAGE C2 ION CHAMBER IG5 SW1 SW2 x10 SW3 xfg ADC C1 x1 FINE GAIN DATA OUT[1..14] Important features: Switch charge injections neutralization Offset error correction Thermal drift compensation TRIESTE, 22 May 2009 RADSYNCH

9 Ouput dose-rate [nsv/h] Linearity Measurements with current generator 1,0E+09 1,0E+08 1,0E+07 y = 1E+15x R 2 = 0,999 Linearity 1,0E+06 1,0E+05 1,0E+04 1,0E+03 1,0E+02 1,0E+01 1,0E+00 1E-14 1E-13 1E-12 1E-11 1E-10 1E-09 1E-08 1E-07 1E-06 input current [na] TRIESTE, 22 May 2009 RADSYNCH

10 Test Conditions & Layout Experimental conditions Linac beam operating at 900 MeV with 70 nsec pulse duration Repetition rate 10Hz Number of pulses 1, 5 and 10 with linac currents of 1mA, 2mA, 5mA, 10mA, 15mA BEAM STOPPER Cu diam. 8cm 150cm PTW diam. 28cm IG5 diam. 18cm IG5 diam. 18cm 9 Deg 9 Deg BEAM 1) ELSE New Gamma Monitor 2) Silena Gamma Monitor 3) Reference system: PTW Ion Chamber Keithley mod ELSE PTW SILENA TRIESTE, 22 May 2009 RADSYNCH

11 Pulsed Beam Response TRIESTE, 22 May 2009 RADSYNCH

12 ELSE Charge (nc) Comparison with reference system 5,0 4,0 3,0 2,0 1,0 0,0 Data at 1 pulse/s with different linac currents y = 0,755x R 2 = 0,996 15mA 10mA 5mA 1mA 2mA PTW dose (ugy) Data at 5 pulse/s with different linac currents TRIESTE, 22 May 2009 RADSYNCH

13 ELSE Charge (nc) ELS 1,0 0, Comparison with reference system PTW dose (ugy) Data at 5 pulse/s with different linac currents y = 0,778x R 2 = 0,998 15mA 10mA 5mA 1mA 2mA PTW dose (ugy) TRIESTE, 22 May 2009 RADSYNCH

14 ELSE Charge (nc) Comparison with reference system Data at 10 pulse/s with different linac currents y = 0,778x R 2 = 0,997 15mA 10mA mA 2mA 5mA PTW dose (ugy) TRIESTE, 22 May 2009 RADSYNCH

15 ELSE/SILENA [uc/h] Continues Pulsed Beam Response 140,00 120,00 Continues Pulsed Beam Response y = 0,853x R 2 = 0, ,00 15mA 80,00 60,00 10mA 40,00 20,00 0,00 5mA 2mA 1mA ELSE SILENA Lineare (ELSE) PTW [mgy/h] TRIESTE, 22 May 2009 RADSYNCH

16 dose rate (usv/h) Long Term Stability Natural background radiation measurements 0,150 0,125 0,100 0,075 G19 Silena GN18 Gamma ELSE GN15 Gamma ELSE 0,050 0,025 0,000 25/03/ /03/ /04/ /04/ /04/ /04/2009 Time G19 Silena GN18 Gamma ELSE GN15 Gamma ELSE Minimum 50,4 nsv/h 98,4 nsv/h 79,7 nsv/h Maximum 55,7 nsv/h 104,0 nsv/h 84,0 nsv/h Average 51,9 nsv/h 102,9 nsv/h 82,3 nsv/h Stand.Dev.% 1,26% 0,65% 0,82% TRIESTE, 22 May 2009 RADSYNCH

17 Conclusions Good accuracy and long term stability with very low input current (10-14 A) at natural background radiation level Good linearity within 7 decades dynamic range up to 10-7 A (high radiation dose rate) Capability to process high number of charges within a very short time interval (up to 100nC in 1ms) Fast time response (<2ms) Capability to detect single shot radiation (e.g. storage ring beam dump) tested up to 3.5 nc/pulse (corresponding to ~4.3 ugy/pulse) Simple calibration of the electrometer through digital offset and gain. TRIESTE, 22 May 2009 RADSYNCH

18 ELSE Electrometer TRIESTE, 22 May 2009 RADSYNCH

19 Radiation monitors inside Elettra Service Area TRIESTE, 22 May 2009 RADSYNCH

20 WE WORK WITH ENERGY IN RADIATION TECHNOLOGY Founded in 1990 design and manufacture analog and digital instrumentations for nuclear radiation application fields Industrial and research nuclear applications Radiation Protection Instrumentation Environmental Nuclear Radiation Monitoring Systems for PET-Cyclotron facilities & Nuclear Medicine Services Hardware & Software development State-of Art Custom design solutions System application El.Se. Srl pays careful attention to the customer satisfaction and works in synergy with their customers, committed to excellence. TRIESTE, 22 May 2009 RADSYNCH

21 Product & Market Product lines Environmental Gamma & Neutron Radiation Monitoring Systems Alpha/Beta particulate Monitoring Systems Air Monitoring Systems Counting Systems & Contamination Monitors Pedestrian & Portal Systems for SNM Special System for decommissioning Main Customers Hospitals, Environmental Agencies, Universities and Research Institutes Particle Accelerators Radiology/Radiotherapy Centers & Nuclear Medicine Laboratories Nuclear Power Plant & Industrial Companies TRIESTE, 22 May 2009 RADSYNCH

22 Gamma & Neutron Monitoring Systems SATURN I Gamma/Neutron Monitors with fixed or removable probes Nausicaa Gamma Monitor Mercury Dual GM Probe Gamma Area Monitor TRIESTE, 22 May 2009 RADSYNCH

23 Alpha/Beta and Air Monitoring Systems Alpha/Beta Particulate Monitors Air/Gas monitoring system Low Background Alpha/Beta Counting System TRIESTE, 22 May 2009 RADSYNCH

24 Monitoring Management Software TRIESTE, 22 May 2009 RADSYNCH

25 Research & Development NSG Project - New Scintillanting Glass (UNIMIB-El.Se.-IEO-Starlite-Fraen-ODL) Special System for Decommissioning TRIESTE, 22 May 2009 RADSYNCH

26 Acknowledgements ELETTRA, Trieste TRIESTE, 22 May 2009 RADSYNCH

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