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Type A uncertainty
Recall that :
b h d f k
i
i
k
b f
i
, t e st ev o un nown quant ty m s not nown ut or N>>
approx mates 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)
i
d
l i i
f
l
( h
type A uncerta nty ecreases as voxe s ze ncreases or ana ogue MC at t e 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