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MJP

Member Since 2008-05-16
Offline Last Active 2011-03-25 12:40

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In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

2011-03-15 21:00:33

Maestro, on 2011-03-15 20:58:48, said:

MJP, on 2011-03-15 20:21:14, said:

Not that simple

Yes, like one poster in the thread about gamma rays you cited said, this type of conversion is "hand-waving style", ie some assumptions about some averages have to be made. Check out page 17 of this operating manual of a nuclear radiation monitor and you see a table equating 100 CPM with 1 µSv. Go and argue with the manufacturer of that apparatus if you like.

Steady down. Why so rude?

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

2011-03-15 20:21:14

Maestro, on 2011-03-15 20:16:26, said:

MJP, on 2011-03-15 20:07:29, said:

Is there a way to convert a radiation reading on a meter from a count-per-minute rate to a rad, rem, or mrem?

I believe the talk was about count-per-minute and microSievert, and Tywais gave the correct answer about the conversion here: http://www.thaivisa....ost__p__4284322

Not that simple

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

2011-03-15 20:07:29

Maestro, on 2011-03-15 19:57:59, said:

MJP, on 2011-03-15 19:33:33, said:

The reading you're seeing is CPM (counts per minute). Multiply by 10 for microsieverts per hour.

I don't think so. From TheFreeDictionary:

Quote

Counts per minute (cpm) is a measure of radioactivity. It is the number of atoms in a given quantity of radioactive material that are detected to have decayed in one minute.

I really should learn not to trust the internet.

Converting from counts to a dose . . .

Is there a way to convert a radiation reading on a meter from a count-per-minute rate to a rad, rem, or mrem?

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

2011-03-15 19:33:33

TheWalkingMan, on 2011-03-15 18:13:26, said:

Here is a live geiger counter in Tokyo
http://www.ustream.t...r-counter-tokyo

and another live geiger counter in Chiba (10km North East of Tokyo)
http://www.ustream.t...r-counter-chiba

Anyone know how to interpret the data?

TheWalkingMan

The reading you're seeing is CPM (counts per minute). Multiply by 10 for microsieverts per hour.

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

2011-03-15 19:24:52

Crushdepth, on 2011-03-15 19:20:25, said:

Quote

“Why I am not worried about Japan’s nuclear reactors.”

On a normal day it would all be good in theory, but several reactor containers have been subjected to fairly large explosions and one is known to be damaged. I wouldn't be too confident that the others are in pristine nick either.

. . . after already suffering an earthquake the magnitude of which was beyond their design limits.

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In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

In Topic: Meltdown Likely Under Way At Japan Nuclear Reactor

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