Live Geiger counter Tokyo....link Ustream

[ElsewheresDaughter]

http://www.ustream.tv/channel/7517126

[Toucano]

1. Interesting, but it could use some context.

Do you know what the number means?

Are we sure it's a reliable source?

[GReedDiamond]

6. 10-20CPM is apparently normal background radiation level...

...therefore, 22+ is exceeding normal levels.

[KittyWampus]

8. Thanks. How interesting someone would do this. Wonder if it's real

[GReedDiamond]

12. Here is another one, must be in a different location of Tokyo...

...although that is speculation on my part.

The levels are still within "normal":

http://www.ustream.tv/channel/geiger-counter-tokyo

[Toucano]

10. Thanks very much! n/t

[nebenaube]

18. hmmm

Manhattan was around 97 in Oct 2001...

[Statistical]

11. Number is in counts per minute. We don't know what it is calibrated to but

a good guess is Cs-137 or Co-60. The reason they are used for calibration is they tend to show up in nuclear attack which is likely when you need a civil defense geiger counter.

If Cs-137 is the calibration source: 120cpm is roughly 0.01mSv
If Co-60 is the calibration source: 1280cpm is roughly 0.01mSv.

If you want split the difference ~150cpm is roughly 0.01mSv.

To put it into perspective. Normal annual background radiation is 2.4mSv (per year).
A CT scan can be up to 50mSv. Chernobyl at the exposed core was 300,000mSv per hour.

[NMDemDist2]

2. looks ok for now...... n/t

[wtmusic]

3. It's climbed .02cpm in the last five minutes. nt

[FreakinDJ]

4. You'll have to explain "CPM" to me

[wtmusic]

5. Counts per minute

Number of times a radioactive particle/ray enters the chamber.

[Statistical]

13. An explanation.

CPM is counts per minute. It is tied to a calibration source. We don't know what it is calibrated to but a good guess is Cs-137 or Co-60. The reason they are used for calibration is they tend to show up in nuclear attack which is likely when you need a civil defense geiger counter.

If Cs-137 is the calibration source: 120cpm is roughly 0.01mSv
If Co-60 is the calibration source: 1280cpm is roughly 0.01mSv.

Since we don't know say ~150cpm = 0.01mSv. Thus 22cpm is 0.00147mSv.

To put it into perspective.
Normal annual background radiation is 2.4mSv (per year).
A CT scan can be up to 50mSv. Chernobyl at the exposed core was 300,000mSv per hour.

[wtmusic]

7. 22.16 CPM at 9PM PST, for reference. nt

[greyl]

9. Just clicked from 22.19 to 22.20. nt

[highplainsdem]

14. Now at 22.22.

[flamingdem]

15. They detected cesium already, worry is that levels will also rise nt

[Rex]

16. They detected it in Tokyo?

[highplainsdem]

17. Yes. Link:

http://www.reuters.com/article/2011/03/15/japan-quake-idUSTKB00735920110315

[lonestarnot]

20. slowly climbing then as now 22.25.

[highplainsdem]

19. 22.23

[wtmusic]

21. Offline.

Perhaps a phone call was made.

[nebenaube]

22. Link just went down... nt

[wtmusic]

23. How reassuring

What they don't know won't hurt them, right? :eyes:

[nebenaube]

24. It was a normal citizen's geiger counter...

He probably had better things to do...

[ElsewheresDaughter]

25. Breaking News: Rueters.....Tokyo detects "minute" amount of radiation

http://www.reuters.com/article/2011/03/15/japan-quake-idUSTKB00735920110315

(Reuters) - "Minute levels" of radiation have been detected in the Japanese capital, Tokyo, Kyodo news agency said, quoting the metropolitan government.

They had found iodine and cesium but it was not immediately clear if it was linked to the damaged nuclear plant in the northeast.

It also said that radiation levels in Saitama, near Tokyo, were 40 times normal levels, quoting the local government.

[right2bfree]

26. Link is dead now. nt

[KittyWampus]

27. worked for me just now on Tuesday morning. Reads 28.83

[ElsewheresDaughter]

28. It's back up and running....10 cpm is normal backround ...it's now 28.69

[Festivito]

29. 26.35cpm 7h25m /nt

[Make7]

30. 28.45 cpm @ 5h58m ( n/t )