Encyclopedia of Environmental Science and Engineering, Volume I and II

1054 RADON

RADON CONCENTRATION (PCI/L)

<.5 .5– 1–

.9 1.9 3.9 7.9 15.931.9 63.9 127.9 256

2– 4– 8– 16– 32– 64– 128–>256

16.33

32.91

23.93

14.65

6.92

3.49

1.00 0.020.21 0.02 0.02

0

10

20

30

40

50

FREQUENCY %

TOTAL MEASUREMENTS = 6, 101

FIGURE 3 Commercial firm radon test distribution, ground level measurements.

RADON CONCENTRATION (PCI/L)

<4 4– 8–

7 15 31 63 127 255 511 1023

16– 32– 64– 128– 256– 512– >1024

13.6

26.4 27.3

17.8

9.1

3.7

1.5 0.4 0.1 0.1

0

10

20

30

40

50

FREQUENCY %

TOTAL HOMES = 4, 107

FIGURE 4 Confirmatory monitoring data distribution.

C018_002_r03.indd 1054C018_002_r03.indd 1054 11/18/2005 11:04:58 AM11/18/2005 11:04:58 AM