ee ee ee
som
TABLE 5
Experimental Evaluation of 0.20 wCi Radon Released into a Chamber (Room)
of 35 m? Volume and Sampled at the Rate of 0.212 m*/min*
Count t1.14
Sample|
Elapsed
Pee’
Time
.
(min)
Counter
Unit
Gross
;
Background
Count fern
ThB+C;
os
Fission
Products
Net
Gross
;
Background
ThB+C:
ae
Fission
Products
Count
Net)
Ratic
:
Correction
Factors
|éeeaféin
Corrected
Count
Flowt
Filter
.
Efficiency
fiat
Expected
Count
,
tia From
100
pCi/m?
Calculated
Radon Conc.
(pCisms)
Pam"
Radon
Corr.
for p
p§
Equilibrium
4
Assumedt
z
]
0-20
D
8840
~313
—122
8405
4740
—313
—114
4313
0.513
4.72
1.00
39670
1395
2844
961
0.29
2
30-50
D
16900
—313
—122
16465
7700
—313
—1l4
7273
0.442
4.72
1.00
77745
2370
3279
1882
0.45
x
a
3
60-80
M
18500
—270
—122
18108
7800
—270
-114
7416
0.410
4.72
1.00
85470
2895
2952
2183
0.56
4
4
90-110
M
17700
—270
—122
17308
7390
—270
—i14
7006
0.405
4.72
1.00
81694
2950
2769
2086
0.58
oa
5
120-140
D
17400
—313
~- 122
16965
7205
—313
—114
|6778
0.400
4.72
1.06
80075
3270
2449
1939
0.60
6
150-170
D
15400
—313
—122
14965
6310
—313
—114
5883
0.393
4.72
1.00
70635
3455
2044
17i1
0.63
7
285-305
M
16500
—270
—122
16108
6600
— 270
—114
6216
0.386
4.72
1.00
76030
3460
2197
1942
0.66
8
310-330
D
16000
—313
—122
15565
6700
—313
—114
6273
0.403
4.72
1.00
73467
3205
2292
1779
0.59
«J
-
*Radon was added during the first 3 min (approx.) of the experiment, cigarene smoke was added 10 min before and 170 min und 305 min after the start of the run. The background of old radon in the room was approximately 500 pCi/mi.
Tl
tReciprocal of 0.212 m/min.
$The expected counts from 100 pCi/m® of radon in equibrium wath is daughters are £130 for counter uni D and 3915 for counter unt M.
§Determined from te-ri/éi i using the 10-mil-absorber curve shown in Fig. 6.