Absorbed dose assessment from short-lived radionuclides of radon (222Rn) decay chain in lung tissue: A Monte Carlo study

Document Type: Original Paper

Authors

1 Physics Department, Hakim Sabzevari University, Sabzevar, Iran

2 Physics Department,Hakim Sabzevari University, Sbazevar, Iran

Abstract

Introduction: Internal exposure from radon gas progeny can lead to the serious biologic damages to the lung tissue. The aim of this study is to evaluate the absorbed dose by lung tissue due to the exposure from short-lived radioactive products of radon (222Rn) decay using Monte Carlo simulation.

Materials and methods: A lung equivalent phantom including 64 air sacs was simulated by MCNPX code. Then, the absorbed dose from short-lived radioactive products of radon decay chain including 218Po, 214Po, 214Pb and 214Bi was calculated for both suspended and deposited states of daughter nuclides inside the lung.

Results: The results showed that alpha decay has more contribution to the lung absorbed dose in comparison with the beta and gamma decay. Furthermore, the received dose by the lung was higher when the radon progeny were deposited inside the lung so that the maximum received dose to lung was 100 times higher than that of calculated in suspended state.

Conclusion: Short-lived daughter radionuclides of radon decay chain, especially alpha emitter products, can be considered as dangerous internal radiation sources. The biological effects of these daughter radionuclides is more severe when are suspended inside the respiratory system.

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Articles in Press, Accepted Manuscript
Available Online from 09 May 2019
  • Receive Date: 09 March 2019
  • Revise Date: 28 April 2019
  • Accept Date: 09 May 2019