Is 2 Million Disintegrations Per Minute a Dangerous Level of Radiation?

[Bixby]

If a rate meter backs into a number of 2 million disintegrations per minute, is this a lot of a little?

I am curious about a comparison - like it is the same amount of radiation coming from a smoke detector. Or - run for your life, that is pure plutonium you are dealing with. :)

Thanks.

 

[Minte]

When determining what is a lot, think, "what does the meter go up to?" Think about the scale of it.

(One Becquerel (Bq) is 60 DPM, by the way.)

Really, it matters how big the sample is. If you've got a massive DPM count, then either the sample is huge or you're dealing with an unstable isotope with a short half-life.

One mole of a substance is 6.022*10^23 atoms, and its mass is its atomic weight in grams. A mol of Radon-222 would weigh 222g, and has a half-life of 3.82 days. You can do the conversions and calculations if you want, but that's not a terribly high DPM count. Radon-222 has an -activity- of 154,000 Curie/g, however, and that's a good amount for the DPM.

What really matters for deadliness is what -type- of emission it is (and the activity). If the DPM is a gazillion, but it's only emitting low-energy alpha particles, hide behind a piece of glass or something and you'll be fine. However, if you've got beta or gamma (or any other kind of emission, generally), it'll take some lead to block it. Get a count in Rads, Rems, Sieverts, Curies, Grays, or some other unit like that. :)

(I took so long composing this post that I'm sure I made a mistake somewhere. Spot it and win a prize. ^^" )

 

[astrokreng]

The number of 2 million disintegrations per minute is a significant amount of radiation. However, it is important to note that the type of radiation and the source of radiation also play a role in determining its potential impact. For example, the radiation emitted from a smoke detector is typically alpha radiation, which has a low penetration power and is not harmful to humans unless ingested. On the other hand, pure plutonium is a highly radioactive material that emits various types of radiation, including alpha, beta, and gamma radiation, which can be extremely dangerous to human health. Therefore, it is not only the quantity but also the type and source of radiation that determine its potential impact. It is always important to follow proper safety protocols and precautions when dealing with any level of radiation.