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Related Experiment Videos

A radiological evaluation of phosphogypsum.

T P Laiche1, L M Scott

  • 1Nuclear Science Center, Louisiana State University, Baton Rouge 70808-5820.

Health Physics
|May 1, 1991
PubMed
Summary

Workers exposed to phosphogypsum, a byproduct of phosphoric acid production, face minimal radiological risks. Measurements show low levels of radium-226 and gamma radiation, ensuring safety during its use in construction.

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Area of Science:

  • Environmental Science
  • Radiological Health
  • Industrial Hygiene

Background:

  • Phosphogypsum, a byproduct of phosphoric acid and fertilizer manufacturing, contains naturally occurring radioactive materials (NORM).
  • Uranium decay products, particularly radium-226 (226Ra), concentrate in phosphogypsum.
  • Phosphogypsum's physical properties make it suitable for construction sub-bases.

Purpose of the Study:

  • To evaluate radiological exposures for workers handling phosphogypsum.
  • To assess radiation levels during the mixing of phosphogypsum with portland cement for construction.

Main Methods:

  • Radiological measurements of radium-226 content in phosphogypsum.
  • Assessment of gross gamma exposure rates on phosphogypsum piles.
  • Measurement of radon daughter concentrations and airborne radium-226 levels.

Main Results:

  • Average 226Ra content was 1.1 +/- 0.3 Bq g-1.
  • Average gross gamma exposure rate was 0.368 +/- 0.006 mu Sv h-1.
  • Radon daughter concentrations ranged from 0.0006 to 0.001 working levels; airborne 226Ra was at background levels.

Conclusions:

  • Worker exposure to radiation during phosphogypsum handling and mixing is low.
  • Radiological risks associated with phosphogypsum use in construction are minimal.
  • The material can be safely utilized in construction applications with appropriate monitoring.

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