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X-rays linked to increased childhood leukemia risk
Date:10/4/2010

Berkeley Diagnostic X-rays may increase the risk of developing childhood leukemia, according to a new study by researchers at the University of California, Berkeley's School of Public Health.

Specifically, the researchers found that children with acute lymphoid leukemia (ALL) had almost twice the chance of having been exposed to three or more X-rays compared with children who did not have leukemia. For B-cell ALL, even one X-ray was enough to moderately increase the risk. The results differed slightly by the region of the body imaged, with a modest increase associated with chest X-rays.

The new findings, published in the October 2010 issue of the International Journal of Epidemiology, come from the Northern California Childhood Leukemia Study, a population-based case-control study that includes 35 counties in the northern and central regions of the state.

While the relationship between high doses of radiation and cancer is well known, significant debate still surrounds the health impacts from the low doses of radiation typical of conventional X-rays, or radiographs.

Natural sources of ionizing radiation are ubiquitous, from the air we breathe to the soil we walk on. Government sources say that, on average, each American is exposed to 360 millirems of radiation a year from both natural and manmade sources, including radon, air travel and diagnostic X-rays. (A rem is the standard unit of measurement of absorbed ionizing radiation in living tissue.)

Ionizing radiation is known to cause cancer in humans, whereas non-ionizing radiation, such as exposures associated with radio signals, microwaves and electric power lines, is not. The dose of ionizing radiation from a single chest X-ray is roughly equivalent to the amount one would get from natural surroundings in 10 days, which is still considered low.

"The general clinical impression has been that the level of radiation a child would be exposed to
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Contact: Sarah Yang
scyang@berkeley.edu
510-643-7741
University of California -- Berkeley
Source:Eurekalert

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