Radiation detection systems

Core Gamma Monitor (CGM)

The RDS Core Gamma Monitor (CGM) is a battery operated monitor system that measures the average net external gamma count in a 10 s counting window (c/10s) that is due to the gamma radiation emitted from core samples and/or drill chips contained inside of a plastic conduit. In order to ensure a higher degree of accuracy of the gamma counting the core samples are kept in the middle of the sliding core counting platform that slides above the gamma detector.

The Φ1"x1" NaI(Tl) scintillation crystal coupled with a low noise photomultiplier tube (PMT) and the high voltage power supply/amplifier board are used to pre-amplify and amplify gamma pulses that are counted and processed by the microcontroller board that includes a two line LCD.

The gamma count rate (c/10s) is displayed every 10, 20, 30 40 50 or 60 seconds.

The scintillation crystal and the PMT are housed inside of a metal cylinder that is inside of the cylindrical lead shielding below the sliding core counting platform with core samples. An additional lead shielding is situated above the cylindrical lead shielding with the scintillation crystal to maintain the low background count.

Other products in category

• Confine Space Entry Radon Daughter Monitor (CSERDM)
• Continuous Radon Monitor (Flow Through Type) (CRM-FTc)
• Environmental Radon Daughter Monitor (ERDM)
• GPS Scintillometer (GPSSC)
• Low Background Alpha Counter (LBAC)
• Personal & Survey Gamma Radiation Monitor (PSGRM)
• Personal Radon Daughter Monitor (PRDM)
• Scintillometer (SC)
• Spot Radon Daughter Monitor (SRDM)
• Targeting Radon Daughter and Radon Monitor (TRDRM ™)