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Low Radon Cleanroom for Underground Laboratories.

Ivan Štekl1, Jirí Hůlka2, Fadahat Mamedov1

  • 1Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, Czechia.

Frontiers in Public Health
|February 19, 2021
PubMed
Summary

This study developed low radon cleanroom technology to minimize radon and aerosol concentrations for sensitive research and nanoelectronics. Prototypes achieved very low radon levels, demonstrating effective radon decay product control and reduced surface deposition.

Keywords:
cleanroomequilibrium factornanotechnologyradonunderground laboratoryzero dose

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Area of Science:

  • Environmental Science
  • Nuclear Physics
  • Cleanroom Technology

Background:

  • Minimizing radon and its decay products is crucial for sensitive research like radiobiology and nanoelectronics fabrication.
  • Deep underground laboratories offer suppressed muon flux and shielding, creating ideal environments for ultra-low radiation studies.
  • Existing cleanroom technologies require further development to achieve extremely low radon concentrations.

Purpose of the Study:

  • To develop and test low radon cleanroom technology capable of achieving radon concentrations below 100 mBq·m3.
  • To minimize radon decay product concentration and surface deposition rates within the cleanroom.
  • To assess the feasibility of creating a
  • zero dose
  • space for specialized applications.

Main Methods:

  • Construction and testing of two low radon cleanroom prototypes with enhanced leakproofness and advanced ventilation systems.
  • Utilizing radon-free air supplied from a dedicated radon trapping facility.
  • Implementing intensive filter-ventilation and monitoring radon concentration, decay products, and surface deposition rates.

Main Results:

  • Achieved radon concentrations as low as 50 mBq·m-3 in the first prototype with the ventilation system switched out.
  • The second prototype, with a fully sealed ventilation system, demonstrated potential for further radon reduction.
  • Preliminary tests showed an extremely low radon decay product equilibrium factor (0.002) and low surface deposition rates (0.05 mBq·m-2·s-1 per Bq·m-3).

Conclusions:

  • Low radon cleanroom technology is feasible for creating controlled environments for sensitive research and manufacturing.
  • Advanced sealing and ventilation are critical for minimizing radon ingress and controlling decay products.
  • Further research is needed to address factors like human radon exhalation into these controlled spaces.