Radon simulation - Effective Dose

[Stalin]

In radon simulation, the dosage / year is a function of radon gas, radon progeny, radioactive and gamma ray.

Right or wrong?

The Effective Dose is ED u/g miner = RP + RG + RD + G

RP = Radon Progeny (WLM)

RG = Radon Gas (Bq/Yr)

RD = Radioactive Dust (Bq/Yr)

G = Gamma (mSv)

[Craig Stewart]

Thanks for the question.  Your function mixes different types of units and values so let's revisit radon exposure.

Dosage/year is a function of the time exposure to ionizing radiation from the radioactive decay of radon gas and its progeny.  Cumulative exposure (dosage) to all combined ionising radiation by humans is normally measured in WLM (Working Levels Months) or mSv (Milli Sieverts) and current allowable limits for workers are typically mandated by many countries at 4 WLM per year, or 20 mSv per year

Ionizing radiation (consisting of alpha, beta particles and gamma radiation) is emitted from radon gas decay or one of the numerous progeny  of radon (elements that have decayed from radon) which form elemental solids.  In fact, it is the tiny solid particles of the progeny of radon (not radon itself - a gas) that gets caught in the lungs and does the most radiation damage.

The ionizing radiation and therefore dosage is therefore not calculated directly from the concentration of radon gas (which is the contained radioactive decay energy potential) usually measured in Bq/litre, but as the decay rate of radon progeny measured as ionizing radiation uJ/m³(which changes over time depending on how long the radon has been decaying)

A great resource for this is available from McPherson's book.  It shows the calculations used by Ventsim and can be found at https://www.mvsengineering.com/files/Subsurface-Book/MVS-SVE_Chapter13.pdf