Biomedical Engineering Reference
In-Depth Information
(a)
What is the PAEC?
(b)
The equilibrium factor?
30.
An air sample taken from a room shows the nuclide activity
concentrations given in Table 4.4. Calculate
(a)
the potential alpha-energy concentration
(b)
the EEDC
(c)
the equilibrium factor.
Tab l e 4 . 4
Problem 30
Concentration
(Bq L
-1
)
Nuclide
222
Rn
9.2
218
Po
4.6
214
Pb
2.7
214
Bi
2.0
214
Po
2.0
31.
A 5-L sample of air contains the activities (disintegrations per
minute, dpm) of radon daughters shown in Table 4.5. Calculate
(a)
the potential alpha-energy concentration
(b)
the equilibrium-equivalent decay-product concentration.
Tab l e 4 . 5
Problem 31
Nuclide
dpm
218
Po
1690
214
Pb
1500
214
Bi
1320
214
Po
1320
A room contains
222
Rn at a concentration of 370 Bqm
-3
.The
PAEC is
7.8 × 10
6
MeVm
-3
. What is the equilibrium factor?
33. (a)
32.
Show that the EEDC for the short-lived
222
Rn daughters is
given by
EEDC = 0.104
C
(
218
Po) + 0.516
C
(
214
Pb) + 0.380
C
(
214
Bi),
where
C
(
218
Po)
,
C
(
214
Pb)
,and
C
(
214
Bi)
are the
concentrations of the daughters indicated.
(b)
What units are implied in this expression?
Why is the expression independent of
C
(
214
Po)
?
(c)
