Table 4 Activity concentrations (Bq kg−1) of 226Ra, 232Th and 40K of the investigated black sand samples.

From: Environmental and mineralogical studies on the stream sediments of Baltim–El Burullus coastal plain, North Delta, Egypt

Sample code No.

Activity concentration (Bq kg−1)

Dair (nGy h−1)

AED (mSv year−1)

ELCR  × 10–3

226Ra

232Th

40K

1

11.1 ± 3.1

8.08 ± 2.8

237.88 ± 88.6

19.8

0.02

0.1

2

11.1 ± 3.1

12.12 ± 4.3

147.11 ± 33.5

18.5

0.02

0.1

3

11.1 ± 3.1

12.12 ± 4.3

147.11 ± 33.5

18.5

0.02

0.1

4

33.3 ± 12.6

4.04 ± 0.9

200.32 ± 41.3

26.0

0.03

0.1

5

33.3 ± 12.7

24.24 ± 9.4

222.23 ± 74.3

39.1

0.05

0.2

6

33.3 ± 12.8

12.12 ± 4.3

147.11 ± 33.5

28.7

0.04

0.1

7

22.2 ± 7.4

32.32 ± 11.3

200.32 ± 41.3

38.0

0.05

0.2

8

22.2 ± 7.4

24.24 ± 9.4

284.83 ± 103.4

36.6

0.04

0.2

9

11.1 ± 3.1

8.08 ± 2.8

181.54 ± 56.6

17.5

0.02

0.1

10

22.2 ± 7.4

12.12 ± 4.3

275.44 ± 94.3

28.9

0.04

0.1

11

11.1 ± 3.1

16.16 ± 5.2

84.51 ± 23.4

18.4

0.02

0.1

12

11.1 ± 3.1

16.16 ± 5.2

259.79 ± 91.2

25.5

0.03

0.1

13

22.2 ± 7.4

8.08 ± 2.8

228.49 ± 56.7

24.5

0.03

0.1

14

11.1 ± 3.1

12.12 ± 4.3

391.25 ± 124.3

28.5

0.03

0.1

15

22.2 ± 7.4

12.12 ± 4.3

262.92 ± 92.3

28.4

0.03

0.1

16

22.2 ± 7.4

12.12 ± 4.3

197.19 ± 66.4

25.7

0.03

0.1

17

33.3 ± 12.7

8.08 ± 2.8

122.07 ± 26.5

25.3

0.03

0.1

18

22.2 ± 7.4

12.12 ± 4.3

200.32 ± 41.3

25.8

0.03

0.1

19

44.4 ± 19.3

40.4 ± 17.4

228.49 ± 75.4

54.3

0.07

0.2

20

22.2 ± 7.4

8.08 ± 2.8

184.67 ± 58.2

22.7

0.03

0.1

21

44.4 ± 19.3

8.08 ± 2.8

150.24 ± 43.7

31.6

0.04

0.1

22

33.3 ± 12.7

36.36 ± 14.2

184.67 ± 58.2

44.9

0.06

0.2

23

11.1 ± 3.1

16.16 ± 5.2

250.4 ± 89.2

25.2

0.03

0.1

24

11.1 ± 3.1

16.16 ± 5.2

241.01 ± 78.9

24.8

0.03

0.1

25

11.1 ± 3.1

4.04 ± 0.9

122.07 ± 26.5

12.6

0.02

0.1

26

11.1 ± 3.1

4.04 ± 0.9

278.57 ± 99.4

19.0

0.02

0.1

27

22.2 ± 7.4

24.24 ± 9.4

203.45 ± 42.3

33.2

0.04

0.1

28

11.1 ± 3.1

12.12 ± 4.3

165.89 ± 46.5

19.3

0.02

0.1

29

11.1 ± 3.1

4.04 ± 0.9

325.52 ± 112.3

20.9

0.03

0.1

30

22.2 ± 7.4

8.08 ± 2.8

253.53 ± 86.4

25.5

0.03

0.1

31

11.1 ± 3.1

8.08 ± 2.8

253.53 ± 86.4

20.4

0.03

0.1

32

22.2 ± 7.4

4.04 ± 0.9

294.22 ± 89.5

24.8

0.03

0.1

33

11.1 ± 3.1

24.24 ± 9.4

266.05 ± 90.2

30.7

0.04

0.1

34

11.1 ± 3.1

12.12 ± 4.3

159.63 ± 53.4

19.0

0.02

0.1

35

11.1 ± 3.1

16.16 ± 5.2

128.33 ± 27.4

20.2

0.02

0.1

36

11.1 ± 3.1

8.08 ± 2.8

65.73 ± 21.2

12.7

0.02

0.1

37

22.2 ± 7.4

12.12 ± 4.3

165.89 ± 46.5

24.4

0.03

0.1

38

22.2 ± 7.4

20.2 ± 6.2

150.24 ± 43.7

28.6

0.04

0.1

39

11.1 ± 3.1

16.16 ± 5.2

200.32 ± 41.3

23.1

0.03

0.1

40

11.1 ± 3.1

40.4 ± 17.4

375.6 ± 180.4

44.9

0.06

0.2

Mean

19.1

14.7

211.0

26.4

0.03

0.1

SD

9.73

9.53

71.34

8.74

0.01

0.04

Min

11.1

4.0

65.7

12.6

0.02

0.05

Max

44.4

40.4

391.3

54.3

0.1

0.2

Egypt, Lake Nasser*

21.0

23.0

155.0

N. M

N. M

N. M

Nile Delta and Middle Egypt**

18.0

17.0

316.0

N. M

N. M

N. M

Nile River sediments from Aswan to Minya***

16.3

12.9

200.2

N. M

N. M

N. M

World average in sediments****

33.0

45.0

420.0

N. M

N. M

N. M

  1. *Data after35. **Data after36. ***Data after37. ****Data after38. N.M not measures.
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