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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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JUNO high purity nitrogen plant.

Xin Ling1, Boxiang Yu2, Zhilong Hou3

  • 1School of Nuclear Science and Technology, University of South China, Hengyang, 421001, Hunan, China.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|March 27, 2024
PubMed
Summary
This summary is machine-generated.

High purity nitrogen (HPN) is crucial for the Jiangmen Underground Neutrino Observatory

Keywords:
High purity nitrogenJUNORadon concentration

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Area of Science:

  • Neutrino physics
  • Detector technology
  • Radioactivity reduction

Background:

  • The Jiangmen Underground Neutrino Observatory (JUNO) requires high purity nitrogen (HPN) with radon concentrations below 10 μBq/m³ for low-background operations.
  • HPN is essential for JUNO's detector purging, pipe cleaning, and scintillator purification.

Purpose of the Study:

  • To design and construct a high-purity nitrogen plant meeting JUNO's stringent radon concentration requirements.
  • To implement effective methods for removing radioactive impurities, specifically radon, from nitrogen gas.

Main Methods:

  • A high-purity nitrogen plant with a maximum rate of 100 Nm³/h was developed.
  • Low-temperature adsorption technology utilizing an activated carbon column with a high height-to-diameter ratio was employed for purification.
  • Radon measurement combined electrostatic collection and low-temperature enrichment methods.

Main Results:

  • The plant successfully reduced radon concentration in nitrogen from 37.4±1.8 μBq/m³ to below 1.33 μBq/m³ after ten days of operation at 50 Nm³/h.
  • After passing through a 1.3 km low-background pipeline, HPN maintained a radon concentration of 5.6±0.6 μBq/m³.

Conclusions:

  • The developed high-purity nitrogen plant effectively meets JUNO's low-background requirements for neutrino physics research.
  • The implemented purification and measurement techniques ensure the necessary quality of nitrogen for sensitive underground experiments.