GPS U-Grade Survey Monitor

The GPS U-Grade Survey Monitor (UGSM)

The UGSM is a gamma radiation survey monitor that measures the external gamma count rate (cps) by a 1" x 1" NaI(Tl) scintillation detector. The detector is housed inside of the lead shielding that is attached to a metal arm bolted to the front of a 4WD. The UGSM measures the gamma radiation emitted from an approximately Φ2 m wide and 0.25 m deep soil or orebody disc. The pulses are logged into the microprocessor based counter board that is coupled with a GPS engine board so the longitude and the latitude could also be logged. The pulse rate is multiplied by the calibration constant (P) to convert the pulse rate into the uranium ore grade (ppm U3O8).

When an external GPS antenna is connected, the reading number, the latitude and the longitude of the reading position, the count rate and the ore grade are logged into the internal memory. The distance in meters between subsequent monitoring/logging positions has to be programmed when the UGSM is in a programming mode. During a survey it is possible to set an alarm count rate (cps) level by the use of 2 momentary switches.

Logged data above can be downloaded into a MSWindow Hyperterminal or Putty and a text file can be opened in MSExcel.

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