söndag 15 maj 2011

110515 - The geiger-counter

It is always good to have a geiger-counter, a tool to measure ionizing radiation. I have a geiger-counter from Imagesco:


http://www.imagesco.com/geiger/digital-geiger-counter.html

But I think there is something wrong with it, because some times it wouldn't react on high radiation. So I plan to buy this one, a gamma-scout:


http://www.gammascout.com/
But due the nuclear accident in Fukushima, Japan, the company has gain too many orders, so it would take time to get one.

Once I borrowed a very, very expensive geiger-counter from a hospital. It was very accurate, but it costed about $ 12 000.

Radiation can be measured in many ways. Here is a simple explanation of the different units.


Decaying

Bequerel
One decay per second is 1 Bq, it is the standard unit for decaying.

Curie
Curie is an older unit. 1 Ci is 3,7 x 10^10 Bq, which be equivalent to the decay of 1 gram of Radium.


Exposition

C/Kg
Coulomb per kilo. Coulomb is a measure of electrical charge. 1 coulomb is the charge of by one second passes a conductor with the current of 1 ampere.

Roentgen
Roentgen (R) is an older unit, which be equivalent to 0,000258 C/Kg


Absorbed dose

Gray
1 Gy is one joule per kilo. One joule is equivalent to move one coulomb, one meter with one volt.

Rad
Rad is an older unit, 1 rad is 0,01 Gy.


Equivalent dose

Sievert
1 Sv is absorbed dose (in gray) multiplied with the quality-factor. The qulity factor is, for;
α-radiation = 20
β-radiation = 1
γ-radiation = 1
n-radiation = 5-20 depending on the energy

Rem
Rem is an older unit, 1 rem is equivalent ro 0,01 Sv.

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