Equipment & Software for Geophysical Surveys: Design, Manufacture, Support, Supply

Borehole scintillation radiometer SRP-20

Main features:
  • Fast assessment of rocks’ natural radioactivity
  • High sensitivity of measurements
  • Portable and easy to use
  • Adjustable averaging window
Price : on request
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Borehole scintillation radiometer SRP-20 − the most advanced version of well-known logging radiometers SRP-97K and SRP-68-02/03 and their analogue in terms of functionality and application. The device is designed to conduct gamma-ray logging in wells up to 300 m depth and drillings. The borehole and hand-held (analogue of SRP-68-01, SRP-88 and SRP-97) versions are in series production.

When conducting gamma-ray logging, a continuous curve or chart is recorded, which displays the intensity of gamma radiation in nSv/h. Due to natural absorption by host rock, ionizing radiation from rocks and objects within a radius of up to 30 cm from the scintillation detector is recorded.

Why SRP-20?
  • Borehole radiometer SRP-20 includes both probe and control unit, so that it becomes all-sufficient system for gamma-ray logging
  • Waterproof detection unit of borehole version can be used both in dry / filled with liquid boreholes and with any types of casing (or without it)
  • Waterproof control unit
  • User friendly interface and simple operation
  • Built-in Bluetooth and USB enable real time data visualization on a PC
  • The instrument can be supplied with a well logging rod feeder system and a set of rods in order to use the probe in horizontal, inclined, and ascending wells and drillings
  • Adjustment of time averaging window enables to record stable data on low level anomalies and provides immediate response during quick scanning
  • Upon request, the detection unit can be manufactured for placing in a more than 300 m deep boreholes
  • Easy-to-use pointer indicator equipped with a stepper motor eliminates oscillations caused by measuring console movement
  • Indicator backlight provides comfort measurements at any conditions
Areas of SRP-20 application:
  • Radioactive / nonradioactive ore exploration
  • Lithology studies in boreholes
  • Identification and refinement of reservoir intervals (oil and gas-saturated formations)
  • Tying to depth during perforating operations
  • Determination of clay content and fracturing of rocks
Package contents:
  • Logging probe
  • Measuring console with built-in battery
  • Charger
  • Headphones
  • Rugged Case
  • Reel with slip ring
  • Well logging rod feeder system with rods (optionally)

Measurement range of exposure dose rate of gamma radiation

0 ÷ 3 000 nSv/h

Fundamental error of measurement of exposure dose rate of gamma radiation of 226Ra radionuclide

no more than ±15% (not standardized in the measurement subrange 30 nSv/h)

Measurement range of the average count rate of recorded gamma

0 ÷ 10 000 s-1

Fundamental error of measurement of average count rate of recorded gamma

no more than ±10%

Energy range of detecting gamma

35 ÷ 3 000 keV

Variation limit of averaging window

1 ÷ 20 s

Setting time of operating mode

no more than 1 min

Power supply voltage

12.5 ± 2 V

Average power

0.9 W

Life time of power supply

no less than 25 h

Operating temperature range

-40 ÷ +50 ˚С


- detection unit

36 × 1010 mm

- measuring console with power supply

200 × 90 × 145 mm


USB, Bluetooth


- detection unit

2.5 kg

- measuring console with power supply

2.6 kg