Tokyo: le radiazioni rilasciate nelle acque dopo l'incidente della centrale nucleare di Fukushima in Giappone potrebbero raggiungere le coste degli Stati Uniti entro quest'anno.
La cosa sta sollevando preoccupazioni tra gli americani, compresi i residenti della città di San Francisco e l'Area di Fairfax, California, che ha approvato una risoluzione il 6 dicembre chiedendo ulteriori test sui frutti di mare costieri.
Allo stesso tempo, oceanografi e scienziati radiologici dicono che tali preoccupazioni sono ingiustificate dato gli attuali livelli di radiazioni nel mare. Secondo i tecnici , in una situazione di normalità la centrale atomica di Diablo Canyon in California scarica più radiazioni in mare, anche se di un isotopo meno pericoloso, che la stazione di Fukushima, che ha subito il peggior incidente nucleare dopo Chernobyl.
"C'è un punto da sottolineare che viviamo in un mondo radioattivo e l'oceano ha isotopi radioattivi in esso", ha detto Ken Buesseler, scienziato senior presso il Woods Hole Oceanographic Institution in Massachusetts, che prevede il pennacchio di Fukushima arriverà negli Stati Uniti all'inizio di quest'anno. "Le persone hanno una conoscenza limitata della radioattività". Alla stazione di Fukushima Dai-Ichi Tokyo Electric Power, dove tre reattori sono fusi dopo il terremoto del marzo 2011 e lo tsunami, circa 300 tonnellate di acque sotterranee contaminate si infiltrano in mare ogni giorno, secondo il governo del Giappone. Tra il maggio 2011 e agosto 2013, ben 20.000 miliardi di becquerel di cesio-137, 10 trilioni di becquerel di stronzio-90 e 40 trilioni di becquerel di trizio sono entrati nel mare tramite le acque sotterranee, secondo la Tokyo Electric. Gli Isotopi di cesio, che emettono raggi gamma , capaci di penetrare la carne, sono tra i più pericolosi radionuclidi emessi dall'impianto, ha detto Colin Hill, professore associato di oncologia di radiazione presso l'Università della Keck School of Medicine della California meridionale. Lo Stronzio-90, che imita il calcio, aumenta il rischio di esposizione per gli esseri umani rimanendo nelle ossa di pesci per lunghi periodi. Mentre il trizio è meno radiologicamente intenso del cesio e passa attraverso il pesce più velocemente dello stronzio, che può anche contaminare le creature marine che incontrano l'isotopo a alti livelli, Hill ha detto. L'Acqua esposta alle radiazioni dalla centrale di Fukushima potrebbe raggiungere gli Stati Uniti a livelli di almeno 100 volte inferiori alla soglia dell'acqua potabile degli Stati Uniti, il presidente della Nuclear Regulatory Commission Allison Macfarlane ha detto in una conferenza 6 dicembre a Tokyo.
-------------------------------------ENGLISH VERSION--------------------------------------------
Tokyo: radiation released into the water after the accident at the Fukushima nuclear plant in Japan could reach U.S. shores later this year.
The thing is raising concerns among Americans, including residents of the city of San Francisco and the area of Fairfax , California, which passed a resolution December 6 , asking further tests on seafood along the coast.
At the same time , oceanographers and radiological scientists say that these concerns are unwarranted given the current levels of radiation in the sea. According to the engineers , in a normal situation the Diablo Canyon nuclear power plant in California get more radiation in the sea, even if a less dangerous isotope , the Fukushima station , which has suffered the worst nuclear accident since Chernobyl .
"There is a point to emphasize that we live in a radioactive world and the ocean has radioactive isotopes in it ," said Ken Buesseler , senior scientist at the Woods Hole Oceanographic Institution in Massachusetts, which provides the Fukushima plume will in the United States earlier this year. " People have a limited knowledge of radioactivity ." At the station of Fukushima Dai- Ichi Tokyo Electric Power , where three reactors melted after the March 2011 earthquake and tsunami , about 300 tons of contaminated groundwater infiltrating into the sea every day, according to the Government of Japan . Between May 2011 and August 2013, 20,000 billion becquerels of cesium -137 , 10 trillion becquerels of strontium -90 and 40 trillion becquerels of tritium entered the sea through groundwater, according to Tokyo Electric. The isotopes of cesium , which emit gamma rays capable of penetrating the flesh, are among the most dangerous radionuclides emitted from said Colin Hill , associate professor of radiation oncology at the Keck School of Medicine of the University of Southern California . Strontium -90 , which mimics calcium increases the risk of exposure to humans remained in the bones of fish for long periods. While tritium is less radiologically intense cesium and passes through the fish as quickly as strontium , which can also contaminate the sea creatures they encounter the isotope at high levels , Hill said . Water exposed to radiation from the Fukushima plant could reach the United States at levels at least 100 times lower than the threshold of drinking water in the United States , the chairman of the Nuclear Regulatory Commission Allison Macfarlane said at a news conference in Tokyo December 6 .
Tokyo: radiation released into the water after the accident at the Fukushima nuclear plant in Japan could reach U.S. shores later this year.
The thing is raising concerns among Americans, including residents of the city of San Francisco and the area of Fairfax , California, which passed a resolution December 6 , asking further tests on seafood along the coast.
At the same time , oceanographers and radiological scientists say that these concerns are unwarranted given the current levels of radiation in the sea. According to the engineers , in a normal situation the Diablo Canyon nuclear power plant in California get more radiation in the sea, even if a less dangerous isotope , the Fukushima station , which has suffered the worst nuclear accident since Chernobyl .
"There is a point to emphasize that we live in a radioactive world and the ocean has radioactive isotopes in it ," said Ken Buesseler , senior scientist at the Woods Hole Oceanographic Institution in Massachusetts, which provides the Fukushima plume will in the United States earlier this year. " People have a limited knowledge of radioactivity ." At the station of Fukushima Dai- Ichi Tokyo Electric Power , where three reactors melted after the March 2011 earthquake and tsunami , about 300 tons of contaminated groundwater infiltrating into the sea every day, according to the Government of Japan . Between May 2011 and August 2013, 20,000 billion becquerels of cesium -137 , 10 trillion becquerels of strontium -90 and 40 trillion becquerels of tritium entered the sea through groundwater, according to Tokyo Electric. The isotopes of cesium , which emit gamma rays capable of penetrating the flesh, are among the most dangerous radionuclides emitted from said Colin Hill , associate professor of radiation oncology at the Keck School of Medicine of the University of Southern California . Strontium -90 , which mimics calcium increases the risk of exposure to humans remained in the bones of fish for long periods. While tritium is less radiologically intense cesium and passes through the fish as quickly as strontium , which can also contaminate the sea creatures they encounter the isotope at high levels , Hill said . Water exposed to radiation from the Fukushima plant could reach the United States at levels at least 100 times lower than the threshold of drinking water in the United States , the chairman of the Nuclear Regulatory Commission Allison Macfarlane said at a news conference in Tokyo December 6 .
Nessun commento:
Posta un commento