personal dosimeter. basically it sounds an alarm if you've been subjected to one millisievert and gives you an idea of how much you're being exposed to. one way to get an idea of the concerns or levels of radiation, but that's sort of the global context trying to piece all the various numbers and pieces of information together. >> and that's what it's all about, sanjay. trying to figure out that information because there are so many unknowns and we know that it's changing literally by the minute. sanjay gupta, thanks, sanjay. in the meantime, hillary clinton is meeting with japan's foreign minister at a g-8 summit in paris where she's offering condolences and pledging america's assistance. >> japan is always is a very generous donor to any disaster