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An investigation at a nuclear research facility revealed high background radiation on air monitors. A thorium research activity caused radon progeny buildup, which was resolved by containing the material.

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Area of Science:

  • Nuclear chemistry
  • Environmental monitoring
  • Radiological safety

Background:

  • The Radiochemical Processing Laboratory requires continuous monitoring of radioactive particulates and tritium in exhaust.
  • Radon releases are tracked separately and reported.
  • Unexpectedly high background radiation was detected during a 2015 calibration of the main stack continuous air monitor.

Purpose of the Study:

  • To investigate the cause of elevated background count rates in the continuous air monitor.
  • To determine the source of increased radon progeny detected on the monitor filter.
  • To assess the impact of the release on facility dose calculations.

Main Methods:

  • Trending historical continuous air monitor data.
  • Comparing air monitor measurements with sampler data.
  • Analyzing the continuous air monitor filter for contaminants.
  • Reviewing building research activities, material handling, and procedures.

Main Results:

  • Continuous air monitor showed increasing background count rates, while emission samples showed no increase.
  • The monitor filter contained elevated levels of radon (Rn) progeny.
  • A research activity involving unsealed thorium (Th) was identified as the source of the Rn release.
  • Repackaging the Th source reduced the monitor's background count rates.

Conclusions:

  • An unsealed thorium research activity led to radon release into the exhaust system.
  • The facility's annual offsite dose contribution from the release was calculated and found to be below permit limits.
  • Containment of the thorium source resolved the issue of elevated background radiation.