March 30, 2011 We've heard about radiation from the damaged nuclear reactors in Japan reaching U.S. shores. Professor Peter Caracappa, of the Rensselaer Polytenchic Institute, talks to Renee Montagne about different types of radiation people encounter and how to weigh the risks.
March 24, 2011 A leading radiation researcher in Japan says it will be tough to study health effects from the Fukushima accident in the population at large. The doses are likely to be small and very difficult to estimate.
March 24, 2011 The shadowy, grainy images bring home in a visceral way the challenges that workers at the Fukushima Dai-ichi plant face, including the very basic obstacle of working in the dark.
March 23, 2011 The warning that Tokyo's tap water contains twice as much radioactive iodine as allowed for infants strikes a particularly distressing chord. And the shortage of bottled water there compounds the anxiety for mothers of formula-fed babies. An expert on radiation offers some practical advice.
March 23, 2011 Workers in Japan want to look inside three troubled reactors at the Fukushima Dai-ichi nuclear power plant. But intense radiation inside the buildings means that it is too dangerous for them to enter. One solution? Robots. They're good at going places where people just don't want to go. And they could be at the site in a matter of days.
March 21, 2011 Reports of radiation-contaminated food in Japan have raised concerns. Here's a reality check: At the highest radioactivity levels detected so far, you'd have to drink an 8-ounce glass every day for 160 years to raise your lifetime risk of getting cancer by 4 percent.
March 20, 2011 Over the weekend, radioactive iodine and cesium emitted by the crippled facility turned up in milk, spinach and other greens, canola seeds, fava beans and drinking water.That poses a new problem: How to inform the public about the multiplying and scary-sounding test results without unduly scaring them.
March 18, 2011 The first ground-level radiation measurements from within a 37-mile radius of the disabled Fukushima Dai-ichi power plant do not reveal any immediate health threat — and perhaps not even any health problems measurable decades from now, if levels stay where they are.
March 18, 2011 Japan's Fukushima Dai-ichi nuclear power plant hasn't been rocked by major incident in a couple of days. But the situation hasn't really improved, either. Are we in a "race against time," as the U.N.'s nuclear watchdog put it, or can we start to breathe easier as time goes on? The answer seems to be: It depends.
March 17, 2011 Dozens of people at and around the Fukushima Dai-ichi power plant reportedly have been decontaminated after exposure to radioactive material. So what's involved in decontamination, and how do you know if it's needed?
March 17, 2011 Any radiation released in a plume from the stricken Fukushima Dai-ichi nuclear power plant in Japan would be diluted before it reached the West Coast of the U.S., a radiation expert says. Taking lessons from the Chernobyl disaster, scientists can approximate how radiation will travel in the atmosphere.
March 17, 2011 A person would have to consume more than 3 pounds of iodized salt to obtain the amount of iodine in a single tablet of potassium iodide for use in a radiation emergency.
March 17, 2011 Japan's nuclear crisis has raised fears about nuclear power around the world, including in the U.S. But advocates of nuclear power say new technology could allay many of those fears. It's possible to build reactors that are much less vulnerable to a meltdown — even if they're abandoned in an emergency.