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222Rn emanation measurements at extremely low activities

Rau1, Heusser

  • 1Max-Plank-Institut fur Kernphysik, Heidelberg, Germany.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 6, 2000
PubMed
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A new system measures radon-222 emanation for the Borexino solar neutrino experiment. It achieves high sensitivity for radon detection in large samples, enabling precise measurements of emanation rates.

Area of Science:

  • Nuclear physics
  • Particle astrophysics
  • Environmental radioactivity

Background:

  • The Borexino experiment requires extremely low background radioactivity.
  • Radon-222 (Rn) is a significant source of background radiation in sensitive experiments.
  • Accurate measurement of Rn emanation from materials is crucial for background reduction.

Purpose of the Study:

  • To develop and characterize a system for measuring radon-222 emanation in large-volume samples.
  • To achieve high sensitivity for Rn detection to enable measurement of low emanation rates.
  • To support the Borexino solar neutrino experiment by characterizing material radioactivity.

Main Methods:

  • Construction of a high-vacuum apparatus using electropolished stainless steel.

Related Experiment Videos

  • Utilizing a sensitive detection method for extracted radon.
  • Employing large-volume emanation chambers (up to 80 liters).

    • Main Results:

    • The system achieves a sensitivity level of 70-100 microBq 222Rn.
    • Specific emanation rates as low as several microBq/m2 can be measured.
    • The apparatus is designed for low blank activity.

    Conclusions:

    • The developed system is highly sensitive and suitable for measuring radon emanation in materials relevant to the Borexino experiment.
    • The large sample capacity allows for precise characterization of material radioactivity.
    • This capability is essential for minimizing background noise in low-energy neutrino detection.