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β
RaC΄ ( 214 Po)
RaA ( 218 Po)
ThC΄ ( 212 Po)
U
(a)
RaC΄ ( 214 Po)
β
RaA ( 218 Po)
ThC΄ ( 212 Po)
U
(b)
FIGURE 17.14  α-Radiation spectra of Uranium and radon daughters received by Millipore FSLW (a) and
LFAS-4 (b) analytical belts and measured by installation UDA-1AB. (From Budyka, A.K. and Borisov, N.B.,
Fibrous Filters for Air Pollution Control , IzdAT, 360p., 2008.)
A task to reproduce the aerosol particles' size distribution spectrum belongs to the class of tasks
not quite correctly formulated, if no presumption is made concerning unknown function. At iltra-
tion of aerosols by a package consisting of ibrous material placed sequentially such task is being
presented as
0
N u
( )
=
E r f r u dr
( ) ( , )
,
I
=
1
,
,
n
(17.31)
i
i
where
r is the radius of particles
N i is the portion of substance, captured by i -ilter
E i is the eficiency of i -ilter in a package considering the substance captured by previous i − 1
ilters u⃗ assemblage of distribution parameters
f is the unknown function (density of distribution by sizes)
n is the number of ilters
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