Page "Alpha decay" Paragraph 21
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The largest natural contributor to public radiation dose is radon, a naturally occurring, radioactive gas found in soil and rock.
These particles continue to decay, emitting alpha particles which can damage cells in the lung tissue.
The death of Marie Curie at age 66 from leukemia was probably caused by prolonged exposure to high doses of ionizing radiation, but it is not clear if this was due to alpha radiation or X-rays.
Curie worked extensively with radium, which decays into radon, along with other radioactive materials that emit beta and gamma rays.
However, Curie also worked with unshielded X-ray tubes during World War I, and analysis of her skeleton during a reburial showed a relatively low level of radioisotope burden.
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