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Radon emanation from low-grade uranium ore
Patitapaban Sahu1, Devi Prasad Mishra, Durga Charan Panigrahi
1Department of Mining Engineering, Indian School of Mines, Dhanbad - 826 004, Jharkhand, India.
Radon emanation in uranium mines was studied to assess inhalation risks. Ore grade strongly correlates with radon emanation rates, enabling better prediction and safety measures in mines.
Area of Science:
- Environmental Science
- Geology
- Occupational Health
Background:
- Radon progeny inhalation poses significant health risks in uranium mines.
- Controlling radon emanation is crucial for worker safety.
Purpose of the Study:
- To investigate radon emanation in laboratory and in-situ uranium mine conditions.
- To determine factors influencing radon migration through ore.
- To establish correlations between radon emanation and ore properties.
Main Methods:
- Laboratory measurements of radon emanation rate and fraction from ore samples.
- In-situ measurements of radon emanation rate from mine walls and drill holes.
- Analysis of ore parameters including grade, radium-226 activity, moisture, density, and porosity.
Main Results:
- In-situ radon emanation rates ranged from 0.22-51.84 × 10(-3) Bq m(-2) s(-1).
- A strong positive linear correlation (r=0.99) was found between in-situ radon emanation rate and ore grade.
- Emanation fraction showed a weak correlation with ore grade and porosity.
Conclusions:
- Ore grade is a key predictor of radon emanation rates in uranium mines.
- Empirical relationships were established for predicting radon emanation based on ore grade and radium-226 activity.
- Findings support improved safety protocols for managing radon exposure risks.
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