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.