A method of determining the position and emission rate of at least one source
of
emanations into an intervening medium, which method comprises measuring the concentration
of the emanations in the intervening medium at selected measurement locations to
obtain observed data, and measuring the velocity of the intervening medium; postulating
a dispersion model; postulating a source model containing source parameters, such
as the position(s) of assumed source(s) and assumed emission rate(s); calculating
with the dispersion model for a postulated source model the concentration that
would arise at the measurement location(s) to obtain synthetic data for the postulated
source model; comparing the synthetic data with the observed data to obtain the
source model that gives the closest fit; and outputting the position and emission
rate of the at least one source assumed in the source model that gives the closest fit.
