FINDER Mode - Locating Source

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Locating a Radiation Source

  • Use the FLIR R400-UW-NGH Finder Mode to determine the exact location of the source.
  • Move the instrument to a low-radiation position for a background measurement.
  • Press L Finder to switch from Dose Rate Mode to Finder Mode.
  • Wait until the FLIR R400-UW-NGH finishes the background measurement, 10 second background. User should be away from the source.
  • If you are in a hurry, you can press R Exit the background measurement (not recommended). The instrument will use the most recent background taken after it was switched on.
  • Move the instrument around to FInd the radiation source.
  • The FLIR R400-UW-NGH averages the count rate for adjustable intervals (see 6.39, p. 183) and will guide you with its display (Figure 69, p. 81) but mainly by emitting sounds indicating the distance to the source. The closer you are to the source, the more "excited" the beeper and the vibrator get.
  • Listening to the beeper, you can move around to look for the source while watching your step instead of the screen.
  • You can change the sensitivity of the beeper (see manual 6.39, p. 183).