Particles that radiate from decaying radon atoms can destroy the living cells they strike and increase the likelihood that those cells will later become cancerous. Researchers have now directly demonstrated that neighboring cells not suffering direct hits can be harmed, too. They’ve also taken a step toward showing how this type of radiation, called alpha particles, indirectly hurts those bystanders.
Radon derives from the decay of uranium and seeps naturally into the air from the ground. It’s the primary environmental source of alpha particles, which contribute to cancer risk by causing aberrations in DNA. Alpha particles from inhaled radon are second only to smoking as a cause of lung cancer.
Because a person’s exposure to alpha particles typically is low, researchers have had to estimate public health threats from radon by guess from the effects of higher dose of alpha radiation. Such data comes primarily from studies of survivors of the atomi
A. They are the killers second only to smoking as cause of lung cancer.
B. B. They can compensate for the abnormal DN
C. High dosage and low dosage of them have the same effect on people’s health.
D. They are the number one killer of people’s health.
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