The "Radiation Network" Radiation Map of USA

I found this interesting. A non-government source of radiation monitoring, with real-time updates:


RadiationNetwork.com

[...] Welcome to RadiationNetwork.com, home of the National Radiation Map, depicting environmental radiation levels across the USA, updated in real time every minute. This is the first web site where the average citizen (or anyone in the world) can see what radiation levels are anywhere in the USA at any time (see Disclaimer below). [...]

The map here is just a screenshot. Follow the link to see the real-time map, and the legend that explains what the numbers mean.
     

Fukushima reactor crisis: What they're doing about it, and who is actually doing it

Japan labors to cool reactors: Workers, power source added

Authorities battling the nuclear disaster at the Fukushima Daiichi power plant have doubled the number of workers on the site to 100 in an effort to continue cooling the three reactors and the spent fuel pools but have abandoned — at least temporarily — plans to use helicopters to dump water on the pools because of the radiation danger. Police may now use water cannons to spray the pools.

Workmen are also nearly finished stringing a new power line from the electrical grid to the power plant, which could ease the situation somewhat by providing a stable source of power for valves and controls at the plant and for pumps supplying water to the spent fuel pools.

It is too late for the electricity to do much good for the three endangered reactors, however, because their cooling systems all appear to have been damaged by the hydrogen explosions that have wracked the plants. Only external pumps can now be used for those reactors.

[...]

Officials are particularly concerned about reactor No. 3 because it is the only reactor at the facility that is fueled with what is known as a mixed oxide fuel. The pellets in mixed oxide fuel contain both plutonium and uranium. Plutonium is highly carcinogenic in small quantities, and its release into the environment would be very dangerous.

[...]

As the crisis at the power plant entered its sixth night, the situation appeared to be deteriorating. One sign was that the Japanese government increased the maximum radiation dose that workers could be exposed to from 100 millisieverts to 250 millisieverts, describing the move as "unavoidable due to the circumstances."

[...]

The good news is that the reactors should be undergoing a certain amount of cooling on their own. When an operating reactor is shut down, it continues to produce a large amount of heat, known as decay heat. Within the first week after a shutdown, that decay heat declines by about 50%, experts said, so that the reactors require less external cooling.

But can they keep it cool enough? If only they had the backup systems days ago, before the hydrogen explosions had damaged the cooling systems.

And who are the people doing this dangerous work?

Praise for 'heroes' working to avert Japan's nuclear catastrophe

(CNN) -- As the rest of the world waits with bated breath to see if Japan can avert a nuclear catastrophe, a small band of experts is putting their lives at risk to prevent the disaster.

Thousands of people living near the troubled Fukushima Daiichi nuclear power plant have been evacuated from their homes because of the risk of radiation leaks from reactors damaged by last week's devastating earthquake and tsunami.

But while most hurry in the opposite direction, about 180 plant workers are staying put -- despite the fact that doing so could result in serious illness or even death -- to battle the meltdown threat.

"The workers at this site are involved in a heroic endeavor," former U.S. Department of Energy Official Robert Alvarez told CNN.

"There is at least fragmentary evidence that in some places on this site there are life-threatening doses of radiation. I think they are doing enormously heroic work"

The workers left at the site are said to be highly trained and experienced nuclear operators, engineers and safety staff with highly specialized knowledge.

Professor Richard Wakeford, of the Dalton Nuclear Institute at the University of Manchester, said for many of them -- despite the highly unusual and potentially dangerous circumstances -- it will be just another day at the office.

"They see it as doing their job," he said. "The Japanese in particular are dedicated to duty, and they will see it as their duty to do what they are doing." [...]

Read the whole thing to see what these workers are facing. It's not as bad as the situation at Chernobyl was, but it's still fraught with many risks. Not just radiation, but hydrogen explosions as well.

I see they are now beginning to . They are working under very trying circumstances. Lets say our prayers that they can get through it, and that the situation can be brought under control.
     

Radiation from Japan. What it means.

This is the most balanced and intelligent thing I've read about it so far:

Japanese plant poses little threat to US — for now

[...] Many experts agreed that radiation would likely dissipate and pose far less danger to people farther away, especially those in other countries.

For one, radioactive cesium and iodine can combine with the salt in sea water to become sodium iodide and cesium chloride, which are common elements that would readily dilute in the wide expanse of the Pacific, according to Steven Reese, director of the Radiation Center at Oregon State.

Winds in the area are currently blowing toward the coast because of a winter storm. But that will change to a brisk wind blowing out to sea at least through Wednesday, he said.

[...]

Even so, many experts here say that this emergency is still nowhere near the level of Chernobyl, the worst nuclear disaster in history.

For one, that reactor's core contained graphite that caught fire, which blasted radiation high into the air and into wind currents that carried it long distances. The Japanese core is metal and contains no graphite, experts said.

The Chernobyl plant also lacked a heavy shell around the reactor core. And the incident there happened quickly, with little time to warn nearby residents.

So far, the radiation released in Japan has not reached high altitudes, said Kathryn Higley, director of the Oregon State University Department of Nuclear Engineering and Radiation Health Physics.

"In addition, radioactive material is sticky. It has a static charge," she said, so it will stick to the sides of buildings, and "rain is going to knock it down."

As a precaution, the World Meteorological Organization has activated specialized weather centers to monitor the situation. Those centers, in Beijing, Tokyo and Obninsk, Russia, will track any contaminants.

Japanese officals said that, early Wednesday, the level of radiation at the plant surged to 1,000 millisieverts before coming down to 800 to 600 millisieverts. Still, that was far more than the average.

Doctors say radiation sickness sets in at 1,000 millisieverts and includes nausea and vomiting.

Damage to blood cells can show up two to four weeks later, said Dr. Fred Mettler, a University of New Mexico radiologist and adviser to the United Nations on radiation safety. He led an international study of health effects after the Chernobyl disaster.

Levels are still likely to be lower away from the plant, said Kelly Classic, a radiation physicist at the Mayo Clinic and a representative for the Health Physics Society, an organization of radiation safety specialists.

The U.S. Nuclear Regulatory Commission says doses of less than 100 millisieverts, or 10 rems, over a year are not a health concern.

By comparison, most people receive about three-tenths of a rem every year from natural background radiation, according the U.S. Environmental Protection Agency. A chest X-ray delivers about .1 millisieverts, or .01 rem of radiation; a CT scan of the abdomen and pelvis is about 14 millisieverts, or 1.4 rems.

If a full meltdown occurs at the Japanese plant, the health risks become much greater — with potential release of uranium and plutonium, said Dan Sprau, an environmental health professor and radiation safety expert at East Carolina University in Greenville, N.C.

"If that escapes," Sprau said, "you've got a whole new ball game there."

That's the big question; will it get worse, and if so, by how much?


Also see: Putting a radiation rumor to rest