Wasabi plants, like these, in Fukushima prefecture were found to contain substantial amounts of radioactive iodine.
March 28, 2011 This week Japan's health ministry released a list of 99 different food products that had tested positive for radioactive iodine-131 and cesium-137 in Tokyo and five other prefectures. Some of those foods might surprise you.
Japanese Prime Minister Naoto Kan bows as he holds a news conference in Tokyo on March 25, 2011.
YOSHIKAZU TSUNO/AFP/Getty Images
March 25, 2011 Japan Prime Minister: nuclear situation is grave
Officers in radiation protection suits hold a blue sheet over patients who were exposed to radiation at the Fukushima complex as they're taken to the hospital.
JIJI PRESS/AFP/Getty Images
March 25, 2011 Japan sees increase in radiation from damaged Fukushima plant
Japanese Buddhist monk Tanaka Tokuun, who was evacuated from Fukushima prefecture, looks over an instrument measuring radiation levels at a hotel on March 17.
Buddhika Weerasinghe/Getty Images
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.
A Tokyo Electric Power Co. worker looks at gauges in the control room for Units 1 and 2 at the Fukushima Dai-ichi plant, Wednesday.
AP Photo/Nuclear and Industrial Safety Agency
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.
A cluster of radiation reading mapped by RDTN.org
March 24, 2011 Amateurs armed with Geiger counters are taking radiation readings in Japan and sending their results to a website for mapping. Radiation experts caution the results, while intriguing, are prone to error.
A live camera from Tokyo Electric Power Co. shows black smoke billowing from the crippled Fukushima Dai-ichi nuclear power plant. in northeastern Japan on Wednesday.
March 23, 2011 Live blog Japan quake, tsunami and nuclear developments
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 21, 2011 The State Department has authorized the distribution of potassium iodide to U.S. government staff in Japan, "out of an abundance of caution." But it's a precautionary step, and nobody should take the pills unless told to do so by U.S. officials.
Tsunami damage in Kessennuma, Miyagi prefecture on March 20, 2011.
NICOLAS ASFOURI/AFP/Getty Images
March 21, 2011 Live blog on Japan disaster developments
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 Radiation worries spark run on protective iodine. But the radiation detected and risk to U.S. residents is vanishingly small, experts say. Separately, a study on the effects of the Chernobyl accident finds thyroid cancer risks remain elevated for Ukrainians who were children or teens 25 years ago.
Noda, in Iwate Prefecture, in northeastern Japan, on March 18, 2011.
David Gilkey /NPR
March 18, 2011 Live Blog Japan Disaster
A boy evacuated from Koriyama, some 37 miles from the Fukushima Dai-ichi plant, gets scanned with a Geiger counter Wednesday.
Ken Shimizu/AFP/Getty Images
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?
A worker at West Marin Pharmacy, Point Reyes, Calif., fills vials with strong iodine solution on Tuesday.
Justin Sullivan/Getty Images
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.
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