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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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