radioactive air monitoring

[Former Oceano]

For those who are interested, it is possible to follow these measures day by day on this site:

http://teleray.irsn.org/irsn/html_irsn/ ... france.htm

[Christophe]

Super interesting but what is the unit used: nGy / h ???? kézako?

[Former Oceano]

NGy / h is nyearGray per hour.

1 Gray (1 Gy) corresponds to the absorption of one joule of energy per kilo of body mass.

When we take into account the efficiency of radiation (ionizing properties in living matter) we pass to Sievert (Sv) by weighting the energy by a factor depending on the radiation (alpha, beta, X or gamma).

1 Sievert (1 Sv) = 1 Joule per kg of body mass, weighted by the effectiveness of the radiation.

The Becquerel is the number of disintegrations per second.

1 Bq = 1 disintegration per second.

[Christophe]

Waw I see that Monsieur is a specialist;) nuclear ...

If I understand correctly :

- there are 3 units (at least) ... Isn't there also the Curie?
- it is the Sv which is the most relevant in relation to the dangerousness?

But what is the link between these units?

And above all what are the standards (EU, World ...)? Because we often hear about Bq in acceptable doses ...

[gegyx]

My good mother! (Eg + Marseille)

And all that is in RAD, in our time ...

[Former Oceano]

The Becquerel is the easiest to measure because we count the number of decays (photons emitted by a scintillator or discharges due to the passage of an ionizing particle in a Geiger counter tube).

For the other measurements, it is necessary to qualify the particles and also measure their energy. On the other hand it is true that for danger measures the Sv is more appropriate.

As regards the Curie, it is based on the number of disintegrations measured in a gram of Radium, found by Marie Curie. As its natural activity is 37 billion disintegrations per second per gram, 1 Ci = 37 10 ^ 9 Bq