Radon exposure, entered as Working Level Months (WLM), can be a point estimate or probability distribution.
Dose entry can be either a single point value, or a probability distribution.
These settings allows the user to control two sampling parameters, sample size and the random seed for sampling.
The User Defined Uncertainty Distribution can be adjusted to account for the presence of additional uncertainty and bias correction not presently included in IREP.
The default setting, a lognormal distribution (GM=1, GSD=1), has no effect on the calculation. Changing the default settings should only be done after sufficient justification accompanied by a written rationale.
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