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@Peter Melzer Rad levels decrease very rapidly from the physical source. I think way to much emphasis is being placed on this hot source being found. Obvious emphasis should be placed on the origional source (why is it there?), but not on the time frame that it was identified.

@RBeaner Exactly, and that holds for any kind of radiation. A simple physical implication that has been eluding my tired mind in the last couple of days. About that 10 Sv/h reading, from what I understood, TEPCO attributes that to remains from the venting procedure they've done in the early days of the crisis before the explosions. According to TEPCO that particular piping system hasn't been used ever since. I supposed whatever radioactive particulates adhered to that piping system must have half-lives in the range of 30 years upwards. Could be Caesium, Strontium or other beta emitters.

@Peter Melzer All I saw was an article saying earlier, then i posted "@Peter Melzer 2 reasons for not finding hot spots earlier. 1. General area surveys are just that, walkways and travel routes vs. component specific surveys. 2. The article said they got indications of high rad while removing debris with remote vehicles in this area. The hot spot was most likely inaccessable earlier. Remember, dependent on the physical size of the high rad spot/area, the rad will drop off very quickly (~double the distance and quarter the dose).
by RBeaner 8/4/2011 6:47:51 AM 2:47 AM"

@Peter Melzer As an informed individual, disregarding the tweets, what do you think the rad levels were 10 ft from this elbow and how did they compare with the elevated levels on this walkway/road area?

@dean Have you ever.... EVER worked at a facility where the workers were decieved about the rad levels they would encounter? There is some little question about the effects of low level, but have you ever seen a worker deceived?

@RBeaner , last Monday I figured at 3 meter distance it should be 1 Sv/h, but I forgot to factor in 4pi, so hypothetically 100 milliSv/h for gamma. The job took an exposure of 4milliSv, if I recall correctly, so that leaves a bit more than 2 minutes to accomplish the job.

@RBeaner Mistakes like this one posted here recently: www.nrc.gov I particularly draw your attention to the 3rd and 4th paragraph.

@dean Do you suppose they get on the bus in reply to one of those "Help the recovery in Fukushima for $600/day" adds, and they're on the bus, and suddenly they see the all-to-well-known Daiichi stacks on the horizon. Wonder what that must feel like, though they'd have to have figured it out anyway, right?

Kan on: “The next era”: The participation of ‘the people’ will decide our future course: kansblog.kantei.go.jp