SI Catalogue

CA N 'T SE E IT - DO E S N 'T ME A N WE DO N 'T HA V E IT - PLEASE ASK www.strength.com.au - 43 - The GR-110G is a rugged, lightweight portable scintillometer designed for the field geologist who requires the accuracy of a digital display, and a large crystal volume for good statistics. In the high sensitivity mode (0.08 to 3.0 MeV), total counts are obtained at either 1 or 10 second intervals. For work where ground cover is highly variable, a 0.4 to 3.0 MeV total count HE (high energy) mode provides more significant geological information since the low energy portion of the spectrum is subject to the largest variations in Compton scatter absorption. The HE mode can also handle the high count rates found in drill core and mine face analysis applications. Special calibration of the GR-110G is not required to maintain high accuracy. All instruments are factory calibrated, and are highly stable so that relative readings from one instrument to another can be compared, and readings made at different times can be plotted on the same basis. The small size and rugged construction of the GR-110G, combined with its accuracy, ease of operation and advanced features, make it an ideal instrument for the field geologist. Features  Sodium-Iodide Detector (4.5 cubic inches)  Light weight - 1.5kg  Adjustable audio threshold  Audio level adjustable to rate  Two energy thresholds  Easy to read large four digit LCD display  Adjustable leather carrying case  Two accumulation periods  Low battery alert  Calibration test source Technical specifications STANDARD ACCESSORIES - Leather case with belt clip and shoulder strap - 137Cs test source - Two "D" cell batteries - PVC storage case - Instruction manual INTERNAL CRYSTAL - - 1.5" x 1.5" x 2.0" (4.5 cubic inches) square cross section NaI (TI) detector with PMT, magnetic shield, and shock mounting DISPLAY - - Liquid crystal type (LCD), 0.5" x 2.0" 4-digit, displays a maximum value of 9999 cps AUDIO OUTPUT - - Audio via high efficiency loudspeaker. Audio threshold is adjustable, and audio level is proportional to the count rate CONTROLS - - Two concentric controls OUTER KNOB - Off - System off - B - Battery check/display test - 1 - 1 second accumulate 0.08 MeV - 3.0 MeV - 10 - 10 seconds accumulate 0.08 MeV - 3.0 MeV - HE - 1 second accumulate 0.40 MeV - 3.0 MeV INNER KNOB - - Audio background control: Permits "zeroing-out" of the background in order to discern small changes in the audio. TIME CONSTANTS - - Audio: 0.5 seconds for 0 to 2,500 cps change CONVERSION FACTORS (For Cesium) - Range 1/10 - - 1 cps = 0.2 x 10-3 mR/Hr = 1.8 x 10-3 µSu /Hr - Range HE - - 1 cps = 0.36 x 10-3 mR/Hr = 3.23 x 10-3 µSu /Hr TEMPERATURE RANGES - - Operating: -25°C to 50°C - Storage: -30°C to 70°C CONSTRUCTION - - Hardened aluminium 0.05" (1mm) thickness case DIMENSIONS - - Approximately 5.3 x 12.4 x 21 cm (2.3" x 4.9" x 8.3") WEIGHT - - 1.5 kg (3.3 pounds) POWER - - Two "D" alkaline cells provide more than 100 hours operation at 15°C ALARM - - Low battery alarm via pulsing audio and flashing display. Signal alarm if threshold is exceeded.

SI Catalogue

Pages