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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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INADEQUACY OF THORON DOSE CALCULATIONS FROM THORON PROGENY MEASUREMENT ALONE.

D Lane-Smith1, F K Wong2

  • 1DURRIDGE Company, Inc., Billerica, MA 01821-2812, USA derek@durridge.com.

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|March 25, 2016
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Conventional methods underestimate domestic thoron (220Rn) exposure by only measuring progeny. This study reveals thoron gas near sources, like concrete walls, contributes significantly to radiation dose, potentially an order of magnitude higher.

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Area of Science:

  • Environmental Science
  • Radiological Protection
  • Nuclear Physics

Background:

  • Domestic radiation exposure assessment often relies on measuring thoron progeny (212Pb).
  • Thoron gas (220Rn) has a short half-life, leading to its concentration near sources, such as concrete walls.
  • Current methods may overlook significant radiation doses from thoron gas itself.

Purpose of the Study:

  • To compare the ionizing radiation dose from thoron gas versus its progeny near the source.
  • To highlight the underestimation of radiation exposure by conventional progeny-only measurements.

Main Methods:

  • Comparison of energy received from thoron gas and thoron progeny radiation near the source.
  • Focus on localized dose assessment near potential thoron emission points.

Main Results:

  • Thoron gas contributes significantly to the localized radiation dose near its source.
  • The dose from thoron gas can be an order of magnitude higher than previously estimated by progeny measurements alone.

Conclusions:

  • Conventional methods measuring only thoron progeny underestimate domestic radiation exposure.
  • Accurate assessment of domestic radiation dose requires considering both thoron gas and its progeny, especially near concrete sources.