It looks as if the news hasn't reached Dr. Busby yet.
In the interview with RT below, he doesn't seem to know "1,800 mSv/Hr radiation" is almost all beta radiation (dose equivalent), and doesn't seem to be aware of what's inside the leaky tanks (hardly any gamma nuclides).
He also sees the Pacific Ocean boiling, or steaming.
And it's all because of an underground fissioning, he says.
From RT (9/2/2013; emphasis is mine):
Fukushima open air fission? Radiation surge can’t be blamed just on random leaks
The latest surge in radiation at Fukushima nuclear plant may suggest not only additional water leaks at the site, but could also mean fission is occurring outside the crippled reactor, explains Chris Busby from the European Committee on Radiation Risk.
The increase in radiation reading is too significant to be blamed on random water leaks, believes Busby.
RT: Just how serious is the situation now in Japan?
Chris Busby: I think this is an indication that it has actually deteriorated significantly, very suddenly in the last week. What they are not saying and what is the missing piece of evidence here is that radiation suddenly cannot increase unless something happens and that something cannot be leakage from a tank, because gamma radiation goes straight through a tank. The tank has got very thin metal walls. These walls will only attenuate gamma radiation by 5 per cent, even when it is 1 cm thick.
Although they may think this is a leak from the tank, and there may well be leaks from the tank, this sudden increase of 1.8 Sieverts per hour is an enormously big doze that can probably kill somebody in 2 to 4 hours.
Today there was another leak found at 1.7 Sieverts per hour in more or less the same place. This huge radiation increase, in my mind means something going on outside the tanks, some radioactive fission is occurring, like an open air reactor, if you like, under the ground.
RT: What impact will this have on the clean-up operation and those who are involved in that operation?
CB: First of all it is clearly out of control and secondly no one can go anywhere near it. Nobody can go in to measure where these leaks are or do anything about them, because anybody who is to approach that sort of area would be dead quite quickly. They would be seriously harmed.
I’ve seen a photograph taken from the air recently, in which the water in the Pacific Ocean is actually appearing to boil. Well, it is not boiling. You can see that it’s hot. Steam is coming off the surface. There is a fog condensing over the area of the ocean close to the reactors, which means that hot water is getting into the Pacific that means something is fissioning very close to the Pacific and it is not inside the reactors, it must be outside the reactors in my opinion.
(Full article at the link)
Again, what we know so far is:
1800 mSv/hr is not gamma radiation but beta radiation, expressed in 70 micrometer dose equivalent to show the effect on skin and eye lens, with effective dose 1/100 of that amount.
It is not "sudden increase" in radiation. This waste water has that order of beta radiation all along, as evidenced by the measurement in the leak in February 2012.
The water leaking is very high in all-beta including strontium but almost devoid of gamma nuclides including radioactive cesium, incapable of giving off gamma radiation to the tune of 1,800 mSv/hr.