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boaz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

How is Radon monitored for in an underground (working) mine

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stuey
50.2% (Neutral)
Newbie

12 years ago

From what I remember, they suck a volume of gas through a filter which picks up radon daughters and then measure the amount of decay intervals per unit time.

This gives you units of Bq (bequerels) per M^3

From this, you can make some assumptions about other factors until you can approximate an absorbed dose in mSv. These units are the ones that officials get excited about.

agricola
50.2% (Neutral)
Newbie

12 years ago

We have two specialist pieces of equipment, one which monitors the quantity of Radon gas and the other which measures the quantity of breakdown products ie Radon daughters. Both pieces are manufactured by genitron. There are other manufacturers out there by the equipment is not cheap. Solid state discs which are tested by the National Radiation body are cheaper and are the sort which you can use to monitor the levels in your house.

I monitor the levels underground in Cornwall at south Crofty on a regular basis.

The quantity of Radon gas is measured in Bq/m3 and the daughters in mWL. From this it is possible to calculate the dose in mSv.

If it can't be grown it has to be mined.

staffordshirechina
50.2% (Neutral)
Newbie

12 years ago

We are currently doing our annual radon check. We use the black plastic discs (with film in?) to do a basic check.
They are returned to Harwell after a set period and we get an estimation of where we stand and what category of supervision we need in place.

Tamarmole
50.2% (Neutral)
Newbie

12 years ago

At the George & Charlotte (tourist mine) we use the black discs supplied by the HPA on the recommendation of HM Inspector of Mines.