Re
re
Sy
SR aRak le ad ol kee ak os
RESULTS
Most of the samples have been collected in the streets and buildings of New
York City. A few have been collected on the rivers around Manhattan and in
mines in the northeastern part of the United States.
are listed in the appendix.
Individual measurements
A summary of the radon flask data appears in the following table.
TABLE I
SUMMARY OF RADON CONCENTRATIONS MEASURED WITH FLASK SAMPLES
No. of
Description
No. of
Locations
Samples
Avg. Ro
Conc.
10-15 c/1
Range
10715 efi -
Manhattan
Streets
23
Precipitation
_ No Precipitation
Buildings
Precipitation
7
OWS
14
—
Ǥ
No Precipitation
Rivers
.
Subway Station
9
33
4
20-490
142
20-490
102
10
190
28
3
127
LT
23
20-230
211
70-10
220
100-410
70-300
6
1
8
2
111
220
"10-170
180-260
4
T
73
10-150
15
he
--
80-110,000
“Iron
5
29
--
Salt, Gypsum, etc.
4
5
Vehicular Tunnel
1
2
120
50-190
Rural and Suburban
Surface
Mines*
Zine
Tale
—
3
3
5
3
-ee
--
" 80-41 ,000
100-2 ,100
8,000-20,000
100-110 ,000_
Hess has been measuring radon concentration in New York City for many
years. His reported average concentrations are listed in Table II.
Average radon concentrations inside and outside of buildings in Sweden
reported by Hultqvist are also shown for comparison.
* Much of these data have been published by Saul J. Harris (3)
.
aay
wae
f,
(8 0