2
LOCKHART AND PATTERSON
TABLE 1
Growth of Radon Daughters in a Fixed Volume of Air on Addition
of Radon at the Rate of 104 Atoms per Minute
rapsed
Activit
Atoms
.
(dis/min)
CRAB.
Activity Rauo
(min)
Rn*
RaA
RaB
RaC
Rn
RaB
(p)
Ro/Ra’
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
0
100,000
200,000|
300,000
400,000
500,000
600,000
700,000
800,000
900,000
1,000,000
1,100,000
1,200,000
1,300,000
1,400,000
1,500,000
1,600,000
1,700,000
1,800,000
0
36.0]
89.7]
145.0
200.4
255.7
311.1
366.5
421.8
477.2
532.6
588.0
643.3
698.7
754.1
809.5
864.9
920.3
975.7
0
30.8
1505]
3523]
618.7!
935.21
1290.4]
1675.4|
2083.5]
2509.4
2949.0
3399.3
3857.9
4329.8
4792.5
5266.1
5742.6
6221.3
|6701.8
0
22}
20.5]
69.3]
155.3|
279.91
441.2}
635.5|
858.8]
1106.9|
1375.9]
1662.0
1962.3}
2274.11
2595.2
2923.8
3258.3
3597.7
3940.8
0
1266]
25.33]
37.99]
50.66]
63.32]
75.98]
88.65|
101.31}
113.98
126.64]
139.30]
151.97]
164.63]
177.30
189.96
202.62 |
215.29
227.95
0
0.71
3.70|
8.82!
15.58]
23.71]
32.85]
42.76]
53.28]
64.271
75.62]
87.24}
99.08|
111.09]
123.2291
135.45]
147.77}
160.14}
172.54]
—
0.071
0.136
0.197
0.251
0.299
0.342
0.379
0.412
0.441
0.467
0.489
0.509
0.526
0.542
0.555
0.567
0.578
0.588
—
17.9
6.85
4.31
3.95
2.67
2.31
2.07
1.901
1.773
1.675
1.597
1.534
1.482
1.439
1.402
1.371
1.344
1.321
*The smail amount of radon decay has been neglected.
cae]
i
*'
o8
4OF
Orr
a
_
oa
3
;
%
a
a
OS --
-
¢\
=
«
230
\
o
ma
~
<a
5
oO
o
© a2
or
~
0
°
OF RADON
\
?
\a
‘
\
\
SINGLE 4
EMISSION \,
Ol a
4
CONTINUOUS EMISSION
4
<q 2.0}—-
/
\
\
Po
2 03
FS
a aa
2
eo O4;-
re
a
'
=
a
,
1
>»
a
9
;
'
I
\
\
a
=
1
1
Q
E
<
— O6r-
\
OF RADON
|
|
|
50
100
150
ELAPSED TIME (MINUTES)
10
200
Fig. 1 — Change in the RaC to RaB atom ratio (p) with the
age of the radon conglomerate after exhalation of radon gas
from the earth
Oo
“
|
50
“Ana
Owhen ie |
100
ELAPSED TIME (MINUTES)
150
a
.
200
Fig. 2 — Change in the radon to RaB activity ratio with
the age of the radon conglomerate