Foolosophy wrote on Mar 29
th, 2011 at 3:26pm:
muso wrote on Mar 29
th, 2011 at 1:25pm:
LOL - touché. Probably fossil fuels will win hands down. Now if you drive a conventional internal combustion vehicle, how does it feel contributing towards all those future deaths?

- and how many of those deaths could we avoid by switching to options like nuclear power, which have the lowest injury and fatality rates of all conventional power generation methods?
just over 23,000 Australian die every year from alcohol related diseases and abuse.
muso,
If you were relatively close to a
breached nuclear reactor core, what sort of radiation levels would your Geiger COunter be measuring?
WOuld 10 million times the background level be a ball park reading depending on how close you got? Something like what TEPCO released to the public and had to withdraw when the Japanese Government considered it too ALARMING for the public to handle emotionaly?
cheers
It depends what you mean by breached. If it was just cracked (and after all the RPV's seem to be holding water for the most part) then the radiation dose would be coming from the water. If it was totally breached (as in Chernobyl) there is no way that anybody could have stepped anywhere near it. An exposed reactor core would be putting out around 300- 1000 Sieverts per hour. (300,000- 1,000,000 mSv/hr). Now the two workers whose feet was exposed to radiation received localised (feet) exposures of 2000- 3000 mSv. If they were exposed to the reactor core, they would be dead after about 10 minutes.
Given that there has been some damage to the fuel rods, I would expect readings of around 500uSv/hr to 1000uSv/hr in the water, because it would be very high in Cesium hydroxide, which is extremely soluble.
My point is that the basement would be totally flooded out and there would be no way of keeping water in the reactor if the core was grossly exposed. Apart from that, steam would not be able to build up pressure, and several independant bodies have talked about steam pressures in each of the reactors.
Reading between the lines, I suspect that the leak is somewhere between a few drops per second and a trickle.
Here is the NISA release on the radioactivity of the water:
http://www.nisa.meti.go.jp/english/files/en20110325-6.pdfRegarding the result of concentration measurement in the stagnant water on the basement floor of the turbine building of Unit 1 of Fukushima Dai-ichi Nuclear Power Station
Radioactive Nuclide Concentration (Bq/cm3)
Cl-38 1.6×10^6
As-74 3.9×10^2
Y-91 5.2×10^4
I-131 2.1×10^5
Cs-134 1.6×10^5
Cs136 1.7×10^4
Cs-137 1.8×10^6La-140 3.4×10^2
It's interesting to note that Uranium was not detected. Chlorine -38 has a half life measured in minutes.