Thursday, 9 August 2012

Radioactive cesium found in Japan’s fish, seawater . . .

 Japanese women sort through freshly caught fish at the Hirakata fish market in Kitaibaraki, Ibaraki prefecture, south of the stricken Fukushima daiichi nuclear power plant number 1 on April 6, 2011 (AFP Photo / Toru Yamanaka)
TINJAUAN 1WC'sChannel 2012: wanita Jepun jenis melalui ikan mereka tangkap di pasaran ikan Hirakata di Kitaibaraki, Ibaraki wilayah selatan yang dilanda Fukushima Daiichi kuasa nuklear loji nombor 1 (1WC'sChannel REVIEW 2012: Japanese women sort through freshly caught fish at the Hirakata fish market in Kitaibaraki, Ibaraki prefecture, south of the stricken Fukushima daiichi nuclear power plant number 1)

Sesium radioaktif yang ditemui dalam ikan, air laut Jepun . . .

Kesan berbahaya sesium radioaktif telah ditemui dalam ikan dan air laut di beberapa kawasan di Jepun, sebagai negara terus untuk membahaskan sama ada ikan mereka adalah selamat untuk digunakan dan protes anti-nuke berkembang ekoran bencana Fukushima.

Kementerian Pendidikan, Kebudayaan, sukan, Sains dan Teknologi (MEXT) Jepun menyatakan bahawa radioaktif sesium, mungkin daripada itu cacat tumbuhan I Fukushima nuklear, telah dijumpai dalam air laut dan ikan dalam kawasan beberapa negara, berita agensi Rusia Itar-Tass dilaporkan dari Tokyo. Radiasi akuatik telah dikesan di tengah Jepun (Shizuoka Wilayah), bahagian barat pusat Honshu (Niigata) dan timur laut negara (Iwate).

Kepekatan zarah radioaktif adalah sangat kecil dan tidak menjejaskan atau memberi risiko kesihatan kepada manusia, MEXT berkata. Kementerian percaya bahawa sesium mungkin telah melakukan perjalanan ke kawasan dalam hujan. Sesium radioaktif isotop radioaktif buatan manusia yang dihasilkan melalui pembelahan nuklear unsur sesium. Ia mempunyai separuh hayat 30 tahun, menjadikannya amat-amat toksik.

Awal tahun ini, tahap rendah radioaktif sesium telah ditemui dalam ikan tidak jauh dari pantai timur Jepun, yang dipercayai berasal dari kilang Fukushima. Kementerian terus memantau dan mengesahkan kesan radiasi dalam air laut dan ikan berikutan bencana nuklear 2011 di kompleks Fukushima-Daiichi.

Sejauh manakah selamatnya ikan dan makanan laut Jepun? Banyak negara terhad import makanan mereka dari Jepun berikutan malapetaka ini. India telah menggantung import makanan dari Jepun selama 3 bulan pada bulan April 2011, kerana bimbang pencemaran radioaktif. EU mengenakan kawalan radiasi yang lebih ketat ke atas import makanan dan makanan haiwan dari Jepun.

Sejauh penuh penyebaran pencemaran radioaktif di Jepun masih tidak jelas. Penemuan ikan dan Jepun radioaktif air laut boleh merosakkan lagi industri makanan laut lesu Jepun. Laporan makanan laut yang tercemar adalah membimbangkan bagi negara ini, kerana air laut yang tercemar dan bergerak ikan di laluan yang tidak terkawal dan tidak bisa dikesan.

Tahap-tahap rendah radiasi nuklear dari bencana Fukushima dikesan dalam tuna bluefin di luar pantai California pada bulan Mei tahun ini, menunjukkan ikan yang membawa bahan-bahan di seluruh Lautan Pasifik lebih cepat daripada angin atau air. Penyelidik Amerika Syarikat yang dijalankan satu kajian yang menunjukkan tuna bertanggungjawab untuk mengangkut radionuklid dari bencana Fukushima 2011 merentasi seluruh Lautan Pasifik Utara.

Banyak soalan sama ada ikan dari Lautan Pasifik dan perairan pantai Jepun adalah selamat untuk dimakan berikutan bencana Fukushima. Pegawai Jepun dan ramai saintis mereka berkata, tetapi data mengenai tahap radiasi dalam stok ikan Jepun memberitahu cerita yang berbeza. Tahap radiasi yang tinggi pada banyak spesis bahawa Jepun telah eksport ke Kanada pada tahun-tahun kebelakangan ini, seperti ikan kod, tunggal, semacam ikan pecak, kokanee daratan, kakap, trout dan belut. Dan tahap radiasi dalam spesis tertentu adalah lebih tinggi tahun ini berbanding pada tahun 2011, laporan Straight.com Vancouver.

Itu tahap tertinggi sesium dalam ikan telah dikesan Mac, setahun selepas kemalangan, apabila 1 salmon masu daratan yang terperangkap dalam sungai Jepun telah dijumpai 18700 Becquerel kilogram per sesium, atau 187 kali had undang-undang Jepun untuk radiasi dalam makanan laut. (Becquerel unit radioaktif yang sama di mana satu mereput nukleus sesaat).

Tim Takaro, merupakan Profesor Madya di Universiti Simon Fraser, kini mengelakkan makan ikan dari Jepun: "Saya akan mencari sumber lain untuk ikan jika saya fikir ia adalah dari kawasan itu," katanya kepada Straight.com. "Terdapat terlalu banyak soalan dan jawapan yang tidak cukup untuk mengatakan semuanya adalah baik." Takaro adalah ahli kumpulan Pakar anti-nuklear Kanada Untuk Hidup Global.

Tragedi Fukushima telah berkecai suci Jepun dalam pergantungan negara dekad-lama tenaga nuklear, demonstrasi anti-nuklear withseveral besar yang berlaku di negara ini sejak beberapa bulan kebelakangan ini.

Radioactive cesium found in Japan’s fish, seawater . . .

Harmless traces of radioactive cesium have been discovered in fish and seawater in several areas of Japan, as the country continues to debate whether their fish is safe to consume and anti-nuke protests grow in the wake of the Fukushima disaster.

Japan’s Ministry of Education, Culture, Sports, Science and Technology (MEXT) stated that radioactive cesium, presumably from the crippled Fukushima I nuclear plant, was found in seawater and fish in several regions of the country, Russian news agency Itar-Tass reported from Tokyo. The aquatic radiation was detected in central Japan (Shizuoka Prefecture), the western part of central Honshu (Niigata) and the country’s northeast (Iwate).

The concentrations of radioactive particles are very small, and pose no health risks to humans, MEXT said. The ministry believes that cesium may have traveled to the area in rainfall. Radioactive cesium is a human-made radioactive isotope produced through the nuclear fission of the element cesium. It has a half-life of 30 years, making it extremely toxic.

Earlier this year, low levels of radioactive cesium were found in fish just off Japan’s east coast, which was believed to have originated from the Fukushima plant. The Ministry continues to closely monitor and verify traces of radiation in seawater and fish following the 2011 nuclear disaster at the Fukushima-Daiichi complex.

How safe is Japan’s fish and seafood? Many countries restricted their food imports from Japan in the wake of the catastrophe. India suspended food imports from Japan for three months in April 2011, fearing radioactive contamination. The EU imposed tighter radiation controls on its imports of food and animal feed from Japan.

The full extent of the spread of radioactive contamination in Japan remains unclear. The discovery of radioactive Japanese fish and seawater could further damage Japan's flagging seafood industry. Reports of contaminated seafood are worrisome for the country, since contaminated seawater and fish move in uncontrollable and untraceable paths.

Low levels of nuclear radiation from the Fukushima disaster were detected in bluefin tuna off the California coast in May of this year, suggesting that fish are carrying the contaminants across the Pacific Ocean faster than wind or water. US researchers carried out a study showing the tuna were responsible for transporting radionuclides from the 2011 Fukushima disaster across the entire North Pacific Ocean.

Many question whether fish from the Pacific Ocean and Japan’s coastal waters are safe to eat in the wake of the Fukushima disaster. Japanese officials and many scientists say they are, but the data on radiation levels in Japan’s fish stock tells a different story. Radiation levels are high in many species that Japan has exported to Canada in recent years, such as cod, sole, halibut, landlocked kokanee, carp, trout and eel. And radiation levels in certain species are higher this year than in 2011, Vancouver’s Straight.com reports.

The highest levels of cesium in fish were detected in March, a year after the accident, when a landlocked masu salmon caught in a Japanese river was found to have 18,700 Becquerel of cesium per kilogram, or 187 times Japan’s legal limit for radiation in seafood. (A Becquerel is a unit of radioactivity equal in which one nucleus decays per second).

Tim Takaro, an associate professor at Simon Fraser University, now avoids eating fish from Japan: “I would find another source for fish if I thought it was from that area,” he told Straight.com. “There are way too many questions and not enough answers to say everything is fine.” Takaro is a member of the Canadian anti-nuclear group Physicians for Global Survival.

The Fukushima tragedy has shattered Japanese faith in the country’s decades-long reliance on nuclear energy, with several large anti-nuclear demonstrations taking place in the country in recent months.

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