Japan Tea Exporters’ Assn.
Situation of Japan after 11th March 2011
Hydrogen explosions scattered radio active substances in the air!
Radio active substances from Fukushima NPP
• 11th March : Massive Earth quake & Tsunami attacked North East Japan
• 12th March : Fukushima Daiichi NPP Unit 1 Hydrogen Explosion
• 14th March : Fukushima Daiichi NPP Unit 3 Hydrogen Explosion
• 15th &16th March : Fukushima Daiichi NPP Unit 4 got fire
• 4th – 10th April : Put out contaminated water into the ocean
• Radio active substances have been emitted into the air from Unit 1 & 3, and will not stop for the time being.
• So, how much radio active substances are falling down on our tea gardens in Japan?
Major tea producing areas in Japan
Distance between Fukushima
Daiichi Nuclear Power Plant to
Shizuoka is 350Km
Kyoto is more than 500Km
away from the site.
Environmental radiation surveillance (falling substances during regular period)
• Everyday, all prefecture report total amount of radio active substances falling on land to the Ministry of Education, Culture, Sports, Science & Technology.
• These data are available from the internet web sites.
• We use these data for estimation of radio active substances on tea leaves.
Radio active substances on major tea producing land (I-131)
3/21 3/22 3/23 3/24 4/5 4/7 4/17 4/18 4/19 Total value on 4/29
MBq/Km2
half life is 8days
Shizuoka 200 150 5.8 4.6 - - - - - 14.1
Mie (Uji) - - - - - 0.98 3.0 30 2.4 15.1
Shiga (Uji) - - - - - - - - - -
Nara (Uji) - - - - - - - - - -
Kyoto (Uji) - - - - - - - - - -
Fukuoka (Yame)
- - - - - - - - - -
Kumamoto - - - - - - - - - -
Miyazaki - - - - 2.5 - - - - 0.3
Kagoshimia - - - - - - - - - -
Tea buds had come out only in Kagoshima by the end of March.
Original data area available from the Ministry of Education,Culture,Sports,Science & Technology
Radio active substances on major tea producing land (Cs-137)
3/21 3/22 3/23 3/24 3/29 3/30 3/31 4/4 4/5 Total MBq/Km2
Half life is 30 years
Shizuoka 72 25 5.9 8 3.1 4.6 3.4 5.5 - 127.5
Mie (Uji) - - - - - - - - - -
Shiga (Uji) - - - - - - - - - -
Nara (Uji) - - - - - - - - - -
Kyoto (Uji - - - - - - - - - -
Fukuoka (Yame) - - - - - - - - - -
Kumamoto - - - - - - - - - -
Miyazaki - - - - - - - - 2.5 2.5
Kagoshimia - - - - - - - - - -
Tea buds had come out only in Kagoshima by the end of March.
Original data area available from the Ministry of Education,Culture,Sports,Science & Technology
Radioactive substances on 1st flush Japanese fresh tea leaves
• CODEX RADIONUCLIDE GUIDE LINE
• I-131: 100Bq/kg
• Cs-137:1000Bq/kg
This season’s Japanese tea from major tea producing areas are safe!
I-131 Cs-137
Estimated Max *1
Actual data *2
Estimated Max *1
Actual data *2
Shizuoka 31.820
or less288
60or less
Mie (Uji) 34.1 - 0 -
Shiga (Uji) 0 - 0 -
Nara (Uji) 0 - 0 -
Kyoto (Uji) 0 ND 0 ND
Fukuoka (Yame)
0 - 0 -
Kumamoto 0 - 0 -
Miyazaki 6 - 0 -
Kagoshimia 0 - 0 -
Bq/Kg
*1 Average Fresh leaves harvested from 10a tea garden in 1st flush is 443Kgs, so 443tons/Km2
*2 We sent some samples to lab for reading radiations.
This season’s 1st flush tea leaves in Japan are harmless!
Reading Radiation on 29th April
• H 50,000μSv/Y• E 1,000μSv/Y• D 400μSv/Y• 200μSv ＝
Round trip Tokyo & London
• 600μSv ＝gastrointestinal X-ray examination
Daily Radiation peak (μSv/h)
0
5
10
15
20
25
30
13-Mar
15-Mar
17-Mar
19-Mar
21-Mar
23-Mar
25-Mar
27-Mar
29-Mar
31-Mar
2-Apr
4-Apr
6-Apr
8-Apr
10-Apr
12-Apr
14-Apr
16-Apr
18-Apr
20-Apr
22-Apr
24-Apr
μSv/
h
Fukushima
Shinjuku(Tokyo)
Shizuoka
Highest peak
Fukushima 24.24μSv/h
Shinjuku 0.161μSv/h
Shizuoka 0.0887μSv/h
Annual Radiation
USA
Chin
a
Hong K
ong
India
France
Germ
any
Italy
Norw
ay
Japan
Sinju
ku (Tokyo)
Shizuoka
0.88
3
1
9.6
2.2
3.8 4.38
10.5
1.26
4.1
1.90.40.5
40.6
7
0.48
0.6
0.48
0.50.6
3
0.43
0
2
4
6
8
10
12
mS
v/Y
Front line shows average annual radiation, and back
taller data shows highest record.
Data of Shinjuku and Shizuoka are estimation for
2011 annual radiation, calculated from the last one
month data and average annual data.
Please Buy Japanese tea for supporting recovery of Japan
Cesium is found in tea leaves from Kanagawa prefecture
• 20th March - 3rd April Total 551MBq/Km2 of Cs137 falling on Chigasaki City in Kanagawa. (551MBq = 551,000,000 Bq)
• 443tons of fresh tea leaves are harvested from 1Km2 tea garden during 1st flush season. (443tons = 443,000 Kgs)
• Maximum possibility of Cs 137 in tea leaves from Kanagawa is 551 ,000,000 / 443,000 = 1,244 Bq/Kg
• Actual data are all bellow CODEX Guide Line Minami Ashigara City 550Bq/Kg, & 570Bq/Kg, Odawara City 780Bq/Kg, Aikawa Town 670Bq/Kg, Manazuru Town 530Bq/Kg, Yugawara Town 680Bq/Kg, Kiyokawa Village 740Bq/Kg
Actual data from Shizuoka prefectureMore data will be reported within a few days
area Izu Numazu Fuji Aoi
(Shizuoka)
Shimizu
(Shizuoka)
Makinohara Omaezaki Kikugawa Iwata
Fresh leave
Bq/Kg
Cs134 45.08 22.63 40.85 55.44 68.12 41.3 50.15
Cs137 53.09 21.60 42.85 61.17 70.65 41.6 60.85
Total 98.17 44.23 83.70 116.61 138.77 82.9 111.1
Cup
Bq/Kg
Cs134 4.78 2.04 1.89 2.62 5.06 3.57 2.43 0.62
Cs137 4.14 2.53 2.03 3.06 5.85 3.31 1.89 1.31
Total 8.92 4.57 3.92 5.88 10.91 6.88 4.32 1.93
I-131 can not found more than 2Bq/Kg , since its half life is only 8days
Cup : 10g tea leaves / 430ml water 90℃ 60sec. Sampling date is 11th and 12th of May.
Tea from Shizuoka prefecture is harmless!!!
Additional test results fromShizuoka prefecture Total Cesium (Bq/Kg)
Area Fresh leaves Cup
Koyama 120.17 N/A (Factory has not yet started)
Gotenba 101.17 5.87
Fujinomiya 105.37 5.68
Fujieda 96.11 6.11
Kawane Honcho 61.87 4.29
Kakegawa 39.83 3.99
Hamamatsu 94.62 5.50
No sample exceed CODEX Guide Line.
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