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Shielding for transporting an 241Am-Be source for industrial applications.

S A Martínez-Ovalle1, A M Garcia-Rodriguez1, H R Vega-Carrillo2

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Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|April 24, 2020
PubMed
Summary

Water-extended polyester (WEP) is the optimal mobile shielding material for Americium-241 Beryllium (241Am-Be) sources in the oil industry. WEP provides effective neutron and gamma-ray shielding, meeting safety standards where other materials fail.

Keywords:
(241)Am–Be sourceAmbient dose equivalentMonte CarloShieldingTransport of radioactive material

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Area of Science:

  • Nuclear Engineering
  • Radiation Shielding
  • Materials Science

Background:

  • Mobile shielding is crucial for handling radioactive sources like 241Am-Be in the oil industry.
  • Effective shielding must mitigate both neutron and gamma-ray radiation to meet international safety standards (2 mSv/h).

Purpose of the Study:

  • To design and evaluate mobile shielding for a 666 GBq 241Am-Be neutron source.
  • To compare the shielding performance of paraffin, water, and water-extended polyester (WEP).

Main Methods:

  • Utilized Monte Carlo simulations to model neutron and gamma-ray transport.
  • Included gamma-ray production from neutron interactions within shielding materials.
  • Calculated ambient dose equivalent rates to assess shielding effectiveness.

Main Results:

  • Paraffin demonstrated superior shielding but is unsuitable due to temperature sensitivity.
  • WEP and water showed similar shielding performance, but water failed to meet dose rate recommendations.
  • WEP shielding met international safety standards and is stable across a wide temperature range.

Conclusions:

  • Water-extended polyester (WEP) is the most suitable material for mobile 241Am-Be source shielding.
  • WEP offers a balance of effective radiation attenuation and material stability for industrial applications.
  • The WEP-based shielding design weighs 66 kg and adheres to safety regulations.