GS-512 Gamma Ray Spectrometer



The GS-512 is designed for 512 channel operation in range of 0,1 to 3MeV,
arbitrary detectors, graphical LCD to display computed data and full spectra,
assay mode for geophysical data: %K, ppm eU, ppm eTh,
8 ROIs (regions of interest) can be set,
real time data output capability of full spectral data up to 1/sec,
as option user's GPS position recording.



APPLICATIONS
FEATURES
DESCRIPTION

The GS-512 is a Gamma Ray Spectrometer designed for field gamma ray spectrometry, especially for determination of K, U, Th contents and total gamma ray activity. The GS-512 Spectrometer uses a power microprocessor to offer the user a range of features. Immediately after the end of measurement, the contents of K [%], U, Th [ppm] or the number of count rates in relevant areas can be displayed. The GS-512 enables the user to check the shape of the complete spectrum and flexibly set the peak areas.
The microcomputer can compute the precise position of the reference peak from the multi-channel spectrum and therefore can stabilise reference peak position through gain control. A simplicity in changing the reference channel allows to use of different reference isotopes.
The non-volatile memory stores the measured data, the measuring parameters and calibration constants. Up to 8,500 measurements can be stored. Complete 512 channel spectra may be recorded internally in memory (more than 400) and allow calibration on test pads. There is also the possibility for retrieval of stored data, via a computer and built-in display. There are the possibilities of imputing the recorded data to the GS-512 for the test of errorless record or for other data handling. In the remote mode all functions are substituted by an external computer control via the RS-232C serial channel.
The GS-512 is powered by six "D" cell batteries or rechargeable batteries. External power supplier 12VDC can be used for mobile, laboratory and stationary installations.


SPECIFICATIONS

The GS-512 consists of the gamma scintillation probe and the console. The front panel keys are of diaphragm type, sealed and weather proof. There are no other pots or setting elements except these keys. Geofyzika probes are available in different volumes to provide the sensitivity and efficiency required and all probes contain very high quality detectors NaI(Tl).

GAMMA SCINTILLATION PROBE GSP-3:

The NaI(TI) scintillation detector 3" x 3", with photomultiplier 3".
Energy resolution for 137Cs better than 8.5 %. Charge sensitive preamplifier. Cable driver. Internal helipot for gain adjustment. High voltage power supply 1 kV positive, internally adjustable +/- 10 %, temperature drift better than 100 ppm/°C. Reference radioisotope source 137Cs, activity of 10 kBq (approx. 0.28 microCi).

DIMENSIONS : dia 125 x 450 mm
WEIGHT: 4,6 kg
TEMPERATURE RANGE : from -10°C to +60°C

CONSOLE GS-512:

AMPLIFIER : 1 microsec. semi-Gaussian shaping, digitally controlled gain +/- 25 %, pole zero cancellation, base line restorer
ANALOG-TO DIGITAL CONVERTER (ADC): 20 MHz, Wilkinson type. Differential non-linearity better than 3 % over 95 % of range. Channel width 5 mV, input range between 50 mV and 2.5 V. Dead-time correction.
MULTICHANNEL ANALYSER: The 512 channels, max. (232 - 1) counts per channel. Live time mode of collection setting in the range 1s to 23:59:59 . Digital output.
DATA HANDLING: A multiple ROI selection. ROI integration with digital data display. Alternative display of U, Th in [ppm] and K in [%] contents or the total gamma ray activity (TOT) in [ppm Uequi]. Serial access.
DIGITAL SPECTRUM STABILIZER: Reference peak setting in the range of 50 to 250 channels, the zero setting means stabilisation is OFF. A digital output for the amplifier gain control.
NON-VOLATILE DATA MEMORY: Internal CMOS RAM powered by a lithium battery. Holding data and measuring parameters plus calibration constants for more than five years. Standard size allows to record as much as 400-600 complete 512 channel spectra or 8,500 four-component data blocks (U, Th, K, TOT) and identifiers. Identifier input manually through keyboard or automatic increment and decrement by step - in the latter case without occupation of memory.
INTERFACE: EIA RS-232 C Standard, for data/spectra transfer and external control by computer.
KEYBOARD: 21 keys on the mono-panel. A diaphragm push-button system, sealed, weather-proof.
DISPLAY: LCD 240 x 128 dots
BUZZER: A 4 kHz beep to indicate the end of measurement or an error condition.
POWER: Six "D" cell replaceable flashing batteries or rechargeable batteries. An external 12 VDC supply. A message at battery voltage lower than 6.5V.
DIMENSIONS: 240 x 200 x 100 mm
WEIGHT: 2.5 kg without batteries
USER'S FUNCTIONS: Special functions can be implemented on user's request. (e.g. user's GPS position recording).



STANDARD COMPONENTS

SatisGeo
portable instruments for geophysics and environment