Mar 5, 2009 | 5
A new study says that the average American is exposed to six times more radiation from medical tests than in the early 1980s, prompting warnings that physicians may be upping patients' cancer risk by giving them unnecessary exams.
A study by The National Council of Radiation Protection and Measurements (NCRP) shows that the average American's overall radiation exposure jumped from 3.6 millisieverts (mSv) to 6.2 mSv per year -- almost entirely a result of radiation-based medical tests. These tests, once responsible for only 15 percent of Americans' exposure to radiation, now account for nearly 50 percent. In contrast, there was almost no change in so-called background radiation, which naturally emanates from soil, rocks and other environmental substances.
Feb 4, 2009 | 3
Cardiologists over the past five years have increasingly come to rely on a technology called cardiac computed tomography angiography (CCTA) to locate artery blockages in the heart. The downside: the procedure exposes patients to potentially cancer-causing radiation. How much radiation? According to a new study, exposure varies from hospital to hospital but the average dose of a single scan is equivalent to about 600 traditional chest x-rays.
Study co-author Thomas Gerber, a cardiologist at the Mayo Clinic in Jacksonville, Fla., says the advantage of CCTA scans is that they provide doctors with a direct view of the heart arteries, revealing tiny blockages that might be missed during traditional stress tests (which entail monitoring the heart rate, breathing, blood pressure and heart rhythm of a patient running on a treadmill). The major worry with such scans, he notes, is that they create images with the help of x-rays, which may increase the risk of developing cancer.
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The Dow Chemical Company is the leading producer of polyalkylene glycols (PAGs) used in synthetic fluids and lubricants where petroleum,
Deadline: Jan 12 2014
Reward: $10,000 USD
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