Tepco radiation readings from most recent presser (fukushima plant)

Hannah Bell

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Wed Mar-16-11 06:18 AM
Original message

Tepco radiation readings from most recent presser (fukushima plant)

Edited on Wed Mar-16-11 06:18 AM by Hannah Bell

This is the handout tepco gave out at the last presser.

http://www.tepco.co.jp/cc/press/betu11_j/images/110316e.pdf

Column 1 is date,
column 2 time,
column 3 i'm guessing monitoring post,
column 4 i believe is gamma radiation,
column 5 "middle - ? - small" radiation
(i'm just going on kanji i remember & don't have easy reference available)
column 6 i think wind direction
column 7 i think wind speed

anyone who reads kanji better please correct

last reading 3/16 = 1591.0 micro sieverts

the high readings on 3/16 (gamma) were:

6400 microsieverts at 10:45
10850 microsieverts at 12:30

for the people who were asking about exact numbers

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FBaggins

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Wed Mar-16-11 08:18 AM
Response to Original message

1. Micro or mini Sieverts?

That actually seems low compared to a couple reported figures.

column 4 i believe is gamma radiation,
column 5 "middle - ? - small" radiation

That would be really bad... but I don't see how it's possible. The Gamma should be much smaller than the other options, not thousands of times higher.

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Statistical

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Wed Mar-16-11 08:23 AM
Response to Reply #1

2. If it was milli everyone would already be dead.

Edited on Wed Mar-16-11 08:25 AM by Statistical

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FBaggins

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Wed Mar-16-11 08:26 AM
Response to Reply #2

3. If they were outdoors and unprotected for awhile? Yes.

Edited on Wed Mar-16-11 08:27 AM by FBaggins

But they're avoiding staying outside when the levels are high and they are far from unprotected.

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Junkdrawer

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Wed Mar-16-11 08:31 AM
Response to Reply #3

5. Yeah. Statistical. A good umbrella should protect up to 1500 millisieverts...

You need a raincoat above that....

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FBaggins

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Wed Mar-16-11 08:47 AM
Response to Reply #5

6. If you find that you can only debate a straw man... isn't it time to quit?

Or do you actually think there's no difference in absorbed dose between an unprotected man and someone wearing the approprate gear?

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Junkdrawer

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Wed Mar-16-11 08:48 AM
Response to Reply #6

7. OK. Galoshes are also needed. n/t

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FBaggins

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Wed Mar-16-11 08:56 AM
Response to Reply #7

9. I think a respirator is in order here.

Important not to breath the stuff. That alone would reduce your risk significantly.

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Statistical

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Wed Mar-16-11 08:27 AM
Response to Original message

4. Nice find. According to Google Translate the unknown column is neutron radiation..

Edited on Wed Mar-16-11 08:45 AM by Statistical

Which is plausible. Is true glad to see that number low, neutron activation is some nasty stuff.
Still would like to have it confirmed by someone who reads Japanese.

The fall off from 10.5mSv to 1.5mSv is encouraging. Likely why they have more people on site now. Heard on the radio they now have 180 people no-site.

1.5mSv is some significant juice but manageable in an emergency. Would take about 3 days to hit 100mSv safety limit. Would take about 30 days to get to 1Sv (when radiation poising begins to affect the individual immediately).

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FBaggins

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Wed Mar-16-11 08:54 AM
Response to Reply #4

8. That is encouraging.

Neutron, IIRC, would only be released in quantity if a fission reaction was going on and containment had failed.

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