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A double chamber system for producing constant radon concentration

B Haider1, J Peter

  • 1GSF Forschungszentrum fuer Umwelt und Gesundheit, Neuherberg, Oberschleissheim, Germany.

Health Physics
|January 1, 1995
PubMed
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This study introduces a novel radon chamber system designed for stable radon gas concentration. A timer-controlled pump and model calculations ensure precise radon levels, compensating for decay and external factors.

Area of Science:

  • Environmental Science
  • Radiological Physics
  • Instrumentation

Background:

  • Maintaining a constant radon concentration is crucial for accurate radiological measurements and research.
  • Radioactive decay and external environmental factors pose challenges to achieving stable radon levels in experimental chambers.

Purpose of the Study:

  • To describe an experimental setup for an intrinsically constant relative radon concentration.
  • To present a method for real-time compensation of radon loss due to decay and external influences.

Main Methods:

  • A system comprising a reference chamber and a storage chamber was developed.
  • A timer-controlled pump regulates radon gas flow, with switching patterns derived from model calculations for decay compensation.
  • A simple timer circuit and computer code were created to generate the timer program.

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Main Results:

  • The theoretical model demonstrates exact compensation of radon loss by radioactive decay.
  • The system allows for online compensation of known external events affecting radon concentration.
  • The influence of airflow stability and chamber leakage on radon concentration was analyzed.

Conclusions:

  • The described experimental arrangement provides a theoretical basis for achieving intrinsic constancy of relative radon concentration.
  • The developed timer circuit and computer code offer a practical approach to generating the necessary control program.
  • Future application of this approach aims to provide a constant radon gas concentration for actual experimental chambers.