A large study found the average US child undergoes more than seven radiation scans by age 18, mostly X-rays; 42 percent had at least one procedure and 25 percent had two or more within three years. Dental X-rays were excluded. CT scans deliver far more radiation than X-rays.
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Government
Are airport scanners safe for travelers?
Four UCSF scientists wrote the White House science adviser about cancer risk from airport x-ray scanners, and one called the FDA's reply deeply flawed. Columbia's David Brenner and Arizona State's Peter Rez each put the dose or risk at roughly 10 times the government's figure.
Environment
Ionizing radiation boosts cardiovascular disease death risk
Health Canada researchers followed 337,397 workers occupationally exposed to ionizing radiation and recorded 3,533 cardiovascular deaths between 1951 and 1995, with risk rising alongside cumulative dose. They caution that non-radiation risk factors went unadjusted.
Drug
Spiral CT cuts lung cancer death risk in heavy smokers
In an NCI-funded trial of more than 53,000 smokers aged 55 to 74, those screened with low-dose spiral CT were 20 percent less likely to die of lung cancer than those given chest x-rays, with 354 lung cancer deaths versus 442. All-cause mortality was 7 percent lower.
Drug
Exposure to x-ray linked to increased risk of prostate cancer
Men who had a hip or pelvic X-ray or barium enema a decade earlier were 2.5 times more likely to have prostate cancer than the general population, in a study of 431 men diagnosed before 60. The researchers stress this is an association, with no proof the radiological tests caused the increase.
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