Distances from T.P (km)

Year

226Ra (Bq.m-3)

 

2003

Range

Mean

< 1.6

 

3.5-20 (18)

7.5

1.6 - 5.0

 

3.5-72.0(20)

15.6

> 5.0

 

3.5-65.3(20)

12.1

 

 

 

 

< 1.6

2004

3.5-41.4(15)

11.0

1.6 - 5.0

 

3.5-29 (17)

7.5

> 5.0

 

3.5-25 (11)

11.5

 

 

 

 

< 1.6

2005

3.5-41.4 (16)

12.6

1.6 - 5.0

 

3.5-29 (19)

7.9

> 5.0

 

3.5-41.4(10)

16.3

 

 

 

 

< 1.6

2006

4.0-16.0 (6)

6.5

1.6 - 5.0

 

3.5-53 (13)

9.2

> 5.0

 

3.5-95 (10)

22.5

 

 

 

 

< 1.6

2007

3.5-26 (10)

7.4

1.6 - 5.0

 

3.5-6.0 (14)

4.0

> 5.0

 

3.5- 19.3 (10)

6.6


*Figures in parentheses are the numbers of samples
Table 2: Concentration of 226Ra in ground water samples in various distance zones.