DeeMaikee a idaA
tae tt tka
Leeation
*
Be
*
fade oR A ee
Range cf
nadiation Levels
eet ieweke we te
Mean
Annual Dose
(sierercentgens/hr)
(illirads)*
-
ae
Average
Pressure
(inebes fs)
oo
Atypical
Radiation Levels
(microroentgens, hr)
Harrisburg, i2.
9.6 - 11.9
(2)
SE
29.5
-
pittsburgh, a.
9.8 - 13.9
(3)
$6
29.2
~
Cleveland, Cnio
10.5 - 11.8
(2)
a1
20.4
8.7 - 16.0
(2)
75
29.5
14.9 (over granite
paving stone}
Chicago, Ill.
10.3 - 11.6
(43
58
2o.4
17.0 (adgacent to
Madisoa, ‘Wise.
1o.l - 16.4
(3)
Ch.
25.1
9.1 - 12.5)
(4)
92
29.3
Sioux Falls,S. Dakota
11.5 - 11.8
(2)
95
28.8
-
,
Cheyenne, Wyo.
17.2 - 17-6
(2)
ike
2h 4
-
C
Denver, Colo.
16.6 - 319.4 (10)
LET
25.0
Toledo, Chio
7
Minneapolis-St. Paul,
.
Minn.
©
U.s. Post Office
Bldg. of granite
construction)
-
}
;
i
3
19.3 - 22.3
(4)
168
2k .2
Grand Junction, Colo.
15.7 - 16.4
(3)
138
25.5
Albuquerque, N. Mexico
13.8 - 14.5
(4)
116
25.
Anarillo, Texas
12.9 - 13.0
(4)
108
26.
-
2.9 - 10.5
(4)
Bi
28.7
~
Tulsa, Obla.
16.6 - 11.6
(4)
92
29.3
-
Little Rock, Ark.
12.5 - 13.3
(2)
166
29.7
-
9.4 - 11.0
(2)
83
29.3
11.1 - 12.3
(2)
a5
29.6
13-3 (near brick
apartment house }
14.6 (neur brick~-faced
notel units)
16.1 (on narrow
Memphis, Tenn.
Chettanooga, Tenn.
i
Mint .ind City and
County Bligs.)
-
Colorado “prings, Colo.
Cxlehoma City, Okla.
q
22.4 (between U.S.
.
-
business street;
* Dose in soft tissue, assuming constant dose rate.
8th between
Broad and barket)
h rad = 100 ergs/em, 1 nicroroentgen/hr = 8.152 mrad/yr.
Table I.
environmental radiation levels measured in principal United States cities
during August, 1957. The nurber of observations for each range are shown in parentheses.
alevated radiation levels produced by localized sources are shown in the last column.