Table 5.3

Measured 222Rn Concentration in Cold Water and Water from Shower at Normal Showering Temperature (Shower Water Collected Near Tub Splash Surface)

Date

Cold Water (222Rn Bq/L)

Shower (222Rn Bq/L)

% Loss

Jun 94

67.34

29.60

 

Mar 95

64.38

9.62

 

Mar 95

57.72

3.55

 

Apr 95

63.27

5.07

 

Apr 95

56.24

1.78

 

Apr 95

55.13

2.55

 

May 95

67.34

2.41

 

May 95

59.57

4.14

 

May 95

53.28

4.81

 

Jun 95

59.94

3.40

 

Aug 95

64.75

10.10

 

Aug 95

74.74

11.06

 

Aug 95

66.97

10.58

 

Aug 95

62.16

6.81

 

Sept 95

46.99

3.61

 

Oct 95

52.91

1.49

 

Dec 95

53.65

1.55

 

Jan 96

55.87

4.07

 

Feb 96

57.35

4.07

 

Apr 96

54.58

3.85

 

Jul 96

47.73

5.14

 

Average

60.00

6.00

90.00

  • into account the average particle size distribution observed in indoor air (Harley 1996). This is compared with the normal home equilibrium of 0.40 and a bronchial dose factor of 0.032 mGy yr-1 per Bq m-3.

    For typical home conditions, the annual shower exposure is a few percent of the whole house exposure attributed to water use. For this reason, the transfer factor is assumed to include both the whole house and showering exposure when calculating dose. The detailed factors given above permit the showering dose and whole house dose to be calculated separately for a specific case.

Table 5.4

222Rn Air Concentration Measured in the Shower Using Passive Alpha Track Detectors

Date

222Rn (Bq m-3)in Shower

Mar–Aug 95

4400

Aug 95–Jan 96

3500



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement