Transcript
SPECTROMETER SYSTEM FOR NUCLEAR RADIATION
GDM 20
•
Ideal for enviromental analysis, food analysis, radon analysis, education...
•
Gerneral spectroscopy and autyomaded routine analysis
•
Easily removable lead shieldingt
•
The high sensitivity of GDM 20 enables rapid analysis at a very low cost per sample
•
Software options: Steel samples Gamma-index
The GDM 20 is a complete scintillation spectrometry system connectable to any PC with a serial port.The system can be used for general spectroscopy or as a dedicated tool for measurement of Cs-137 or radon concentration in air or water.The WinDAS software, included with the system, is easy to use and offers automatic routines for cesium and radon analysis. The software handles single spectra, series of spectra and MCS spectra. Each type of spectrum can be recorded manually or with a preset measurement time or a preset number of counts. Other software routines e.g. for automated analysis of activity in steel samples and gamma-index calculations are available as options.
Gammadata Instrument AB P.O. Box 151 20 | SE-750 15 UPPSALA | SWEDEN Phone: +46 18 480 58 00 | Fax: +46 18 555 888 | E-mail:
[email protected] | Internet: www.gammadata.net
SPECTROMETER SYSTEM FOR NUCLEAR RADIATION
Technical Specifications
GDM 20
Sensitivity
uncertainty (%)
For cesium samples according to the following diagram:
100 50 2 Bq/kg 20 10 Bq/kg 10 50 Bq/kg
5
300 Bq/kg 2 1 0.2
0.5
1
2
5
10
20
50
100
200
500
measurement time (minutes)
Detector unit • NaI detector (3" x 3") with PMtube. • Energy resolution < 7.0% full width half maximum at 661 keV. • Cylindrical lead shielding (10 cm thick). Filling: removable lead pellets, 325 kg. Sample containers: 1 litre, 200 ml and 60 ml. • High-voltage supply: 0-1400 V. Continuously adjustable by a 10turn potentiometer. Stability 100 ppm/°C, 0 to 50°C. • Dimensions Height: 94 cm Diameter: 42 cm Weight: 34 kg + 325 kg lead Electronic unit • Amplifier time constant: 2 µs. • Discriminator adjustable up to 100% of full range by 10-turn potentiometer. • Analog/Digital Converter: 1024 channels, 50 MHz clock frequency.
•
The spectrometer system GDM 20
Integral non-linearity: ± 0.2% over 98% of full range. Differential nonlinearity: ± 2% deviation from average channel width over 98% of full range. Power supply: Input 200 VAC, 50/60 Hz, 73 mA Output ± 15 V, 200 mA, supports detector unit.
Computer interface Connects to PC, RS-232 interface. Miscellaneous Instruction manual for GDM 20, WinDAS software manual, calibration sources and sample containers are provided with the system. Options • Radon charcoal canister • Radon-in-water canister • Alpha and Beta detector • Computer
Software WinDAS – Data Acquisition System for Windows Win95/NT/98/ME/XP. Including routines for automatic recording and calculation of Cs-137 + Cs-134 and radon gas activity. Modes – PHA, MCS and MSP can be run in parallel or separately. Compensation – rate calculation is automatically dead-time compensated. Correction – automatic time correction when subtracting files. Smoothing – adjustable smoothing function. File-Load/save binary or ASCII files. Calibrations – Energy calibration with automatic scaling, automatic recording and calculation of specific activity. Customized software On request the software can be designed with dedicated analysis routines to meet customer needs.
Gammadata Instrument AB P.O. Box 151 20 | SE-750 15 UPPSALA | SWEDEN Phone: +46 18 480 58 00 | Fax: +46 18 555 888 | E-mail:
[email protected] | Internet: www.gammadata.net
December 2004
The uncertainty at a confedence level of 67 % as a function of the measurement time (Marinelli 1 litre).
