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ホーム > 組織別情報 > 経済産業部 > 茶業農産課 > 茶業農産課/お茶 > Test Results on Tea Produced in Shizuoka Prefecture

ここから本文です。

更新日:平成23年12月27日

Test Results for Radioactivity on Tea Produced in Shizuoka Prefecture

 The Shizuoka Prefectural Government conducted tests for radioactivity on tea produced in Shizuoka prefecture. Research on first harvest fresh tea leaves and brewed tea tests revealed that radioactivity values fell below the provisional regulation values enforced by the Nuclear Safety Commission of Japan and the Food Sanitation Act of Japan. The measured results are in table1

 With regard to the first harvest of processed tea produced in Shizuoka prefecture, tests conducted on June 7 and 9 in 19 locations determined that radioactivity levels did not exceed the regulatory values. The measured results are in table2.

 Tests on second harvest of crude tea were conducted from June 10 to July 8 in 19 locations of Shizuoka prefecture, and it was determined that radioactivity did not exceed the regulatory values. The measured results are in table3.

 Tests on autumn harvest of crude tea were conducted from September 16 to 28 in 19 locations of Shizuoka, and it was determined that radioactibity did not exceed the regulatory values. The measured result are in table4.

 However, voluntary tests conducted on June 9 by a private company reported that tea produced in Warashina and Ryogohchi areas, both within Shizuoka city, exceeded regulatory values. Official tests were immediately conducted, and it was indeed confirmed that radioactive levels had exceeded regulatory values in Warashina area. The Shizuoka Prefectural Government called for shipment restraint and voluntary recall of the concerned tea sources. The measured results are in table5. 

 The Shizuoka Prefecural Government also analyzed factories in Warashina and confirmed that radioactive levels exceeded regulatory values in five tea factories. With this result, the Shizuoka Prefectural Government called for shipment restraint and voluntary recall of the affected tea sources. The measured results are in table6.

 The provisional regulation values enforced by the Nuclear Safety Commission of Japan and the Food Sanitation Act of Japan are in table7.

 1. Announcement for Shizuoka Tea Consumers

 2. How to handle green tea leaves which exceeded provisional regulatory values

 3. Announcement regarding exported Shizuoka tea to France

 Please click here to download PDF file. (PDF:85KB)

 Table1   Radioactivity Levels of First Harvest Tea (Fresh tea leaves and brewed tea)                            (Bq/kg)       

Sampling District

Cesium-(134+137)

Iodine-131

 Sampling Date

 

Fresh tea leaves

Brewed tea*

Fresh tea leaves

Brewed tea*

 
Izu

379

N.A.

2.3

N.A.

5/9/11

Izu

98

8.9

N.D.

N.D.

5/12/11

Izu

N.A.

14

N.A.

N.D.

5/15/11

Oyama

120

12

N.D.

N.D.

5/13/11

Gotenba

101

5.9

N.D.

N.D.

5/13/11

Numazu

44

4.6

N.D.

N.D.

5/12/11

Fujinomiya

105

5.7

N.D.

N.D.

5/13/11

Fuji

84

3.9

N.D.

N.D.

5/12/11

Shizuoka (Aoi-ku)

117

5.7

N.D.

N.D.

5/12/11

Shizuoka (Shimizu-ku)

139

11

N.D.

N.D.

5/12/11

Fujieda

96

6.1

N.D.

N.D.

5/13/11

Kawanehoncho

62

4.3

N.D.

N.D.

5/13/11

Makinohara

90

N.A.

0.9

N.A.

5/6/11

Makinohara

N.A.

6.9

N.A.

N.D.

5/12/11

Omaezaki

75

N.A.

0.6

N.A.

5/10/11

Omaezaki

83

3.0

2

N.D.

5/2/11

Kikugawa

111

4.3

N.D.

N.D.

5/7/11

Kakegawa

40

4.0

N.D.

N.D.

5/13/11

Fukuroi

22

1.6

N.D.

N.D.

5/15/11

Iwata

46

N.A.

0.4

N.A.

5//9/11

Iwata

N.A.

1.9

N.A.

N.D.

5/2/11

Mori

73

3.4

N.D.

N.D.

5/15/11

Hamamatsu(Tenryu)

95

5.5

N.D.

N.D.

5/13/11

 Tests were conducted and analyzed by the Shizuoka Prefecture's Environmental Radiation Monitoring Center using γ-ray spectrometer (Germanium semiconductor detector)
 Measuring period: 2,000sec  N.D.: Not detectable    N.A.: Not applicable
 *Test conditions are as follows:

Amount of processed tea

60 g

Amount of water

2,580 ml

Extracting temperature

90 ℃

Extracting time

60 sec

   

 Table2  Radioactivity Levels of First Harvest Processed tea                                                                          (Bq/kg)

Sampling District

Cesium-(134+137)

Iodine-131

Sampling Date

 

Processed tea*

 
Izu

359

N.D.

6/8/11

Oyama and Gotenba

128

N.D.

6/8/11

Numazu

225

N.D.

6/7/11

Fuji

359

N.D.

6/7/11

Fujinomiya

349

N.D.

6/8/11

Shizuoka (Aoi-ku and Suruga-ku)

413

N.D.

6/8/11

Shizuoka (Shimizu-ku)

368

N.D.

6/8/11

Shimada (excluding the former Kanaya-cho and Kawane-cho)

311

N.D.

6/6/11

Former Kanaya-cho

385

N.D.

6/6/11

Fujieda

305

N.D.

6/6/11

Kawanehoncho and Former Kawane-cho

350

N.D.

6/6/11

Makinohara

272

N.D.

6/6/11

Omaezaki

149

N.D.

6/7/11

Kikugawa

184

N.D.

6/6/11

Kakegawa

146

N.D.

6/6/11

Morimachi

158

N.D.

6/8/11

Iwata

194

N.D.

6/6/11

Fukuroi

141

N.D.

6/7/11

Hamamatsu

265

N.D.

6/8/11

 Tests were conducted and analyzed at the Yokohama Quarantine Station.           N.D.: Not detectable

 *Above processed teas are not blended and have a determined tea source location.

 Table3   Radioactivity Levels of Second Harvest Tea (Fresh tea leaves and Crude tea)     (Bq/kg)       

Sampling District

Cesium-(134+137)

Iodine-131

 Sampling Date

 

Fresh tea leaves

Crude tea

Fresh tea leaves

Crude tea

 
Izu

60

358

N.D.

N.D.

7/1/11

Oyama and Gotenba

31

115

N.D.

N.D.

7/4/11

Numazu

33

119

 N.D.

 N.D.

 6/19/11

Fuji

37

223

N.D.

N.D.

6/15/11

Fujinomiya

 46

181

N.D.

N.D.

 6/16/11

Shizuoka(Aoi-ku)

N.A.

13

N.A.

N.D.

6/9/11

Shizuoka(Aoi-ku)

32

N.A.

N.D.

N.A.

6/16/11

Shizuoka(Shimizu-ku)

 57

259

N.D.

N.D.

6/19/11

Shimada

6

174

N.D.

N.D.

6/14/11

Shimada(Kanaya)

35

131

N.D.

N.D.

6/15/11

Fujieda

30

212

N.D.

N.D.

6/15/11

Kawane(Kawanehoncho, Shimada-city kawane)

N.A.

106

N.A.

N.D.

6/19/11

Kawane(Kawanehoncho, Shimada-city kawane)

29

N.A.

N.D.

N.A.

6/20/11

Makinohara

N.A.

138

N.A.

N.D.

6/9/11

Makinohara

52

N.A.

N.D.

N.A.

6/15/11

Omaezaki

44

N.A.

N.D.

N.A.

6/13/11

Omaezaki

N.A.

191

N.A.

N.D.

6/15/11

Kikugawa

34

170

N.D.

N.D.

6/13/11

Kakegawa

28

100

N.D.

N.D.

6/16/11

Mori

27

106

N.D.

N.D.

6/13/11

Iwata

N.A.

54

N.A.

N.D.

6/9/11

Iwata

20

N.A.

N.D.

N.A.

6/13/11

Fukuroi

21

74

N.D.

N.D.

6/15/11

Hamamatsu(Hamamatsu, Tenryu, Tatsuyama, Haruno)

29

109

N.D.

N.D. 

6/28/11

 Tests were conducted and analyzed at the Yokohama Quarantine Station.   N.D.: Not detectable   N.A.: Not applicable

Table4   Radioactivity Levels of Autumn Harvest Tea   (Bq/kg)       

Sampling District

Cesium-(134+137)

Iodine-131

Sampling Date

 

Crude tea

 
Izu

123

N.D.

9/26/11

Oyama and Gotenba

59

N.D.

9/26/11

Numazu

37

N.D.

9/28/11

Fuji

60

N.D.

9/26/11

Fujinomiya

69

N.D.

9/22/11

Shizuoka(Aoi-ku)

43

N.D.

9/27/11

Shizuoka(Shimizu-ku)

46

N.D.

9/27/11

Shimada(excluding the former kanaya-cho and kawane-cho)

35

N.D.

9/27/11

Former Kanaya-cho

40

N.D.

9/27/11

Fujieda

39

N.D.

9/27/11

Kawanehoncho and former Kawane-cho

8

N.D.

9/27/11

Makinohara

44

N.D.

9/21/11

Omaezaki

49

N.D.

9/26/11

Kikugawa

37

N.D.

9/26/11

Kakegawa

24

N.D.

9/26/11

Morimachi

33

N.D.

9/20/11

Iwata

37

N.D.

9/16/11

Fukuroi

21

N.D.

9/26/11

Hamamatsu

28

N.D.

9/26/11

N.D.: Not detectable

Table5  Additional Research based on Voluntary Test Results    (Bq/kg)                                             

Sampling District

Processed tea

 

Cesium-(134+137)

Iodine-131

Shizuoka Aoi-ku Warashina

679

N.D.

Shizuoka Shimizu-ku Ryogohchi

461

N.D.

 Measured results were analyzed at the Yokohama Quarantine Station.     N.D.: Not detectable

Table 6  Additional Research for First Harvest of Tea produced in Warashina District based on Voluntary Test Results  (Bq/kg)  

Sampling Factory

Cesium-(134+137)

Iodine-131

 Sampling Date

Shizuoka Aoi-ku Warashina Area

Processed tea*

Brewed tea**

Processed tea*

Brewed tea**

 

Factory A

393

N.A.

N.D.

N.A. 

6/13/11

Factory B

 161

N.A.

N.D.

N.A. 

6/13/11

Factory C

499

N.A.

N.D.

N.A.

6/13/11

Factory D

380

N.A.

N.D.

N.A.

6/13/11

Factory E

614

N.A.

N.D.

N.A.

6/13/11

Factory E

N.A.

 5.8

N.A.

N.D.

6/14/11

Factory F

328

N.A.

N.D.

N.A.

6/13/11

Factory G

340

N.A.

N.D.

N.A.

6/13/11

Factory H

428

 N.A.

N.D.

 N.A.

6/13/11

Factory I

602

N.A.

N.D.

N.A.

6/13/11

Factory I

N.A.

7.8

N.A.

N.D.

6/14/11

Factory J

459

N.A.

N.D.

N.A.

6/13/11

Factory K

604

N.A.

N.D.

N.A.

6/14/11

Factory K

N.A.

7.8

N.A.

N.D.

6/16/11

Factory L

581

N.A.

N.D.

N.A.

6/14/11

Factory L

N.A.

7.6

N.A.

N.D.

6/16/11

Factory M

180

N.A.

N.D.

N.A.

6/14/11

Factory N

415

N.A.

N.D.

N.A.

6/14/11

Factory O

408

N.A.

N.D.

N.A.

6/14/11

Factory P

457

N.A.

N.D.

N.A.

6/14/11

Factory Q

654

N.A.

N.D.

N.A.

6/14/11

Factory Q

N.A.

7.3

N.A.

N.D.

 6/16/11

Factory R

496

N.A.

N.D.

N.A.

6/14/11

Factory S

397

N.A.

N.D.

N.A.

6/14/11

Factory T

490

N.A.

N.D.

N.A.

6/14/11

*Measured results were analyzed at the Yokohama Quarantine Station.

**Measured results were analyzed at the Shizuoka Prefecture Environmental Radiation Monitoring Center.

N.D.: Not detectable    N.A.: Not applicable

Table 7  The Provisional Regulation Values enforced by the Nuclear Safety Commission of Japan and the Food Sanitation Act of Japan.  (Bq/kg)

Fresh tea leaves

Processed tea

Brewed tea*

Cesium-(134+137)

Iodine-131

Cesium-(134+137)

Iodine-131

Cesium-(134+137)

Iodine-131

500

N.A.

500

N.A.

200

300

*There is no provisional regulation value for brewed tea, therefore, regulatory values for drinking water in accordance to the Ministry of Health, Labour and Welfare of Japan is applied.

N.A.: Not applicable

Announcement for Shizuoka Tea Consumers

 Radioactive cesium of 679 Bq/kg, which is slightly above the provisional regulation of 500 Bq/kg enforced by the Food Sanitation Act of Japan, was detected in a portion of tea grown in the Warashina area of Shizuoka city. However, when brewed for drinking, the radioactive cesium level significantly drops (1/85) and therefore does not present any negative health influence. (This is based on research conducted by Shizuoka Tea Research Center.)

Table 7: Test results for radioactivity in Kikugawa city (Shizuoka Tea Research Center)     (500Bq/kg)

 

Fresh tea leaves

Crude tea (A)

Brewed tea (B)

B/A

Cesium-(134+137)

111

367

4.3

1/85

Provisional regulation value*

500

500

200

NA

*As there is no provisional regulation value for brewed tea, regulatory value for drinking water in accordance to the Ministry of Health, Labour and Welfare of Japan is applied. NA: Not applicable

How to handle green tea leaves which exceeded provisional regulatory values

 【Announcement from Shizuoka Prefectural Government Agriculture Promotion Division】

 Tests conducted by the Shizuoka Prefectural Government confirmed that no harm is imposed on the surrounding areas of the stored or shipped packages of tea that exceeded provisional regulatory values.

Announcement regarding exported Shizuoka tea to France

 The French DGCCRF authorities announced on June 17th that tea from Shizuoka was detected with radioactive cesium that exceeded EU regulations of 500 Bq/kg. In response, the Ministry of Agriculture, Forestry and Fisheries of Japan (MAFF) identified on June 20th (Monday) that concerned tea was "Genmaicha" produced for exports. MAFF quickly amended this announcement the following day that the concerned tea was in actuality first harvest tea "Sencha".

 Moreover, the Shizuoka Prefectural Government conducted tests for radioactivity on tea stored by exporting companies and found radioactive levels to exceed regulatory values. With this result, the government called for shipment restraint and voluntary recall of the exported teas. In addition, it was confirmed that brewed tea for drinking did not exceed provisional regulatory values and does not present negative health influence.

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