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An Assessment of Radiation Doses From Radon Exposures Using a Mouse Model System

Mirsch, Johanna ; Hintz, Lisa ; Maier, Andreas ; Fournier, Claudia ; Löbrich, Markus (2021):
An Assessment of Radiation Doses From Radon Exposures Using a Mouse Model System. (Publisher's Version)
In: International Journal of Radiation Oncology*Biology*Physics, 108 (3), pp. 770-778. Elsevier, ISSN 0360-3016,
DOI: 10.26083/tuprints-00018931,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: An Assessment of Radiation Doses From Radon Exposures Using a Mouse Model System
Language: English
Abstract:

Background

Radon and its progenies contribute significantly to the natural background radiation and cause several thousands of lung cancer cases per year worldwide. Moreover, patients with chronic inflammatory joint diseases are treated in radon galleries. Due to the complex nature of radon exposure, the doses associated with radon exposures are difficult to assess. Hence, there is a clear need to directly measure dose depositions from radon exposures to provide reliable risk estimates for radiation protection guidelines.

Objectives

We aimed to assess tissue-specific radiation doses associated with radon activity concentrations, that deposit similar dose levels as the annual natural radon exposure or radon gallery visits.

Methods

We exposed mice to defined radon concentrations, quantified the number of 53BP1 foci as a measure of induced DNA damage, and compared it with the number of foci induced by known doses of reference-type radiations. An image-based analysis of the 3-dimensional foci pattern provided information about the radiation type inflicting the DNA damage.

Results

A 1-hour exposure to 440 kBq/m³ radon-induced DNA damage corresponding to a dose of ∼10 mGy in the lung and ∼3.3 mGy in the kidney, heart, and liver. A 1-hour exposure to 44 kBq/m³ provided values consistent with a linear relationship between dose and radon concentration. Two-thirds of the dose in the lung was caused by α-particles. The dose in the kidney, heart, and liver and one-third of the dose in the lung likely resulted from β- and γ-rays.

Discussion

We found that radon exposures mainly lead to α-particle-induced DNA damage in the lung, consistent with the lung cancer risk obtained in epidemiologic studies. Our presented biodosimetric approach can be used to benchmark risk model calculations for radiation protection guidelines and can help to understand the therapeutic success of radon gallery treatments.

Journal or Publication Title: International Journal of Radiation Oncology*Biology*Physics
Journal volume: 108
Number: 3
Publisher: Elsevier
Classification DDC: 500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie
Divisions: 10 Department of Biology > Radiation Biology and DNA Repair
Date Deposited: 12 Aug 2021 12:14
Last Modified: 12 Aug 2021 12:14
DOI: 10.26083/tuprints-00018931
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-189318
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/18931
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