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MEASUREMENTS OF AIRBORNE CONCENTRATIONS OF RADON AND THORON DECAY PRODUCTS.

S Chalupnik1, K Skubacz1, P Urban1

  • 1Silesian Centre for Environmental Radioactivity, Central Mining Institute, Pl. Gwarkow 1, 40-166 Katowice, Poland.

Radiation Protection Dosimetry
|October 17, 2017
PubMed
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This study modified thermoluminescent detectors (TLD) for simultaneous long-term monitoring of radon and thoron decay products, offering direct potential alpha energy concentration (PAEC) measurements. This TLD method complements liquid scintillation counting (LSC) for calibrating portable monitors.

Area of Science:

  • Environmental Science
  • Radiological Health
  • Nuclear Physics

Background:

  • Liquid scintillation counting (LSC) is used for environmental radionuclide monitoring, including radon and thoron decay products, but is limited to grab sampling.
  • Long-term monitoring of radon and thoron decay products requires alternative techniques, such as monitors of potential alpha energy concentration (PAEC) using thermoluminescent detectors (TLD).

Purpose of the Study:

  • To modify the Alfa-2000 sampling probe for simultaneous long-term measurements of radon and thoron PAEC using CaSO4:Dy TLDs.
  • To evaluate the TLD method for direct measurement of dose-relevant deposited energy, independent of equilibrium factors.
  • To explore the use of LSC for calibrating portable radon decay product monitors.

Main Methods:

  • Utilized CaSO4:Dy thermoluminescent detectors (TLDs) within the Alfa-2000 sampling probe, equipped with three independent heads over a membrane filter in a microcyclone dust sampler.

Related Experiment Videos

  • Modified the TLD technique to enable simultaneous measurement of radon and thoron PAEC.
  • Employed Liquid Scintillation Counting (LSC) as an absolute calibration method for portable radon decay product monitors.

    • Main Results:

    • The modified TLD system allows simultaneous measurement of PAEC and dust content.
    • TLD chips store alpha particle energy, enabling direct readout of potential alpha energy, bypassing equilibrium factor dependencies.
    • The TLD method measures deposited energy, which is directly relevant to radiation dose.

    Conclusions:

    • The modified Alfa-2000 sampling probe with TLDs provides a viable method for simultaneous, long-term monitoring of radon and thoron PAEC.
    • TLD-based PAEC monitoring offers a direct measure of dose-relevant energy, complementing LSC's absolute calibration capabilities.
    • This technique enhances environmental monitoring of radioactive decay products.