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Table 3 Radiocesium data information in five regions in Fukushima prefecture examined between May 2011 and March 2014 in the present study

From: Radioactive cesium accumulation in freshwater fishes after the Fukushima nuclear accident

Region

Number of analysed betweeen May 2011 and March 2012

Number of data above detection limit betweeen May 2011 and March 2012 (Ratio of detectable (%))

Number of analysed betweeen April 2012 and March 2013

Number of data above detection limit betweeen April 2012 and March 2013 (Ratio of detectable (%))

Number of analysed betweeen April 2013 and March 2014

Number of data above detection limit betweeen April 2013 and March 2014 (Ratio of detectable (%))

Total Cs*

134Cs

137Cs

Total Cs*

134Cs

137Cs

Total Cs*

134Cs

137Cs

Sousou region

10

10

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

  

(100)

          

Iwaki region

31

26

n/a

n/a

9

7

3

4

7

2

1

2

  

(83.9)

   

(77.8)

(33.3)

(44.4)

 

(28.6)

(14.3)

(28.6)

Fukushima region

37

37

n/a

n/a

58

57

57

57

65

63

56

63

  

(100)

   

(98.3)

(98.3)

(98.3)

 

(96.9)

(86.1)

(96.9)

Koriyama region

43

42

n/a

n/a

70

57

43

57

83

48

26

48

  

(97.7)

   

(81.4)

(61.4)

(81.4)

 

(57.8)

(31.3)

(57.8)

Aizu region

210

188

n/a

n/a

541

369

278

364

358

230

117

228

  

(89.5)

   

(68.2)

(51.3)

(67.3)

 

(64.2)

(32.7)

(63.7)

  1. *Total Cs = 134Cs + 137Cs.
  2. Total Cs was available between May 2011 and March 2014.
  3. 134Cs + 137Cs were available between April 2012 and March 2014.
  4. n/a: not applicable.