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Type A uncertainty
➢
Recall that :
b, the stdev of unknown quantity m is not known but for N>>
approximates m
and the square root of the variance
approximates b.
therefore forms precision confidence interval (k=3) of our tally and it must be
as low as possible.
➢
Type A uncertainty decreases ~ 1/sqrt(N)
➢
type A uncertainty decreases as voxel size increases for analogue MC (at the expense
of volume averaging)
➢
the only other way to decrease type A would be to reduce Var(k) which is in essence
an efficiency gain and will be discussed later