Range cf
Radiation Levels
(migroroentgens/hr)
Location
Mean
Annual Dose
(millirads)*
Average
Pressure
(inches Hg)
Atypical
Radiation Levels
(microrcentgens/hr)
Harrisburg, Pa.
9.6-11.9
(2)
e8
29.8
-
Pittsburgh, Fe.
9.8 - 13.$
(3)
$6
29.2
-
Cleveland, Chio
10.5 - 11.8
(2)
Lie
29.4
Toledo, Ohio
8.7 - 10.0
(2)
BA)
29.5
14.9 (over granite
Chicago, Ill.
16.3 - 11.6
(4)
83
294
17.0 (adjacent to
paving stone}
<
U.8. Post Office
Bldg. of granite
construction)
-
10.1 - 10.4
(3)
ob
29.1
9.1 - 12.5
(3)
92
29.3
-
Sioux Falls,S. Dekota
11.5 - 11.8
(2)
95
28.8
-
Cheyenne, Wyo.
17.2 - 17.6
(2)
142
24.k
-
Denver, Colo.
16.6 - 19.4 (10)
147
25.0
Madison, Wisc.
Minneapolis-St. Paul,
Minn.
22.4 (between U.S.
Mint and City and
County Bligs.)
Colorado Springs, Colo.
19.3 - 22.3
(4)
168
2h 2
Grand Junction, Colo.
15.7 - 18.4
(3)
138
25.5
-
Albuquerque, N. Mexico
13.8 - 14.5
(4)
116
25.2
-
Amarillo, Texas
12.9 - 13.6
(4%)
1¢8
26.4
-
9.9 - 10.5
(4)
4
28.7
-
Tulsa, Okla.
10.8 - 11.6
(4)
92
29.3
-
Little Rock, Ark.
12.8 - 13.3
(2)
106
29.7
-
9.4-11.0
(2)
83
29.8
11.1 - 12.3
(2)
95
29.6
13.3 (near brick
apartment house)
14.8 (near brick-faced
Oklahoma City, Okla.
Memphis, Tenn.
Chattsnooga, Tenn.
-
motel units }
16.1 (on narrow
business street;
8th between
Broad and Market)
* Pose in soft tissue, assuming constant dose rate.
iL rad = 100 ergs/gm, 1 microroentgen/hr = 8.152 mrad/yr.
Table I. Environmental radiation levels measured in principal United States cities
during August, 1957. The number of observaticns for each range are shows in parentheses.
Blevatz* valiaviczs Levels preduced by lecalics*? sources sr2 shown in the least column.
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