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Radiation levels in Japan are continuously monitored in a number of locations, and a large number stream their data to the internet. Some of these locations are mandated by law for nuclear power plants and other nuclear facilities. Some of them serve as part of a national monitoring network for use in a nuclear emergency.
In the first week of September the Ministry of Science published a new map showing radiation levels in Fukushima and four surrounding prefectures, based on the results of an aerial survey. In the map, different colors were used to show the level of radiation at locations one meter above the ground. Red: 19 microsieverts per hour or higher.
Fukushima I and II Nuclear Accidents Overview Map showing evacuation and other zone progression and selected radiation levels. The Japanese reaction occurred after the Fukushima Daiichi nuclear disaster, following the 2011 Tōhoku earthquake and tsunami. A nuclear emergency was declared by the government of Japan on 11 March.
Safecast is an international, volunteer-centered organization devoted to open citizen science for environmental monitoring.Safecast was established by Sean Bonner, Pieter Franken, and Joi Ito shortly after the Fukushima Daiichi nuclear disaster in Japan, following the Tōhoku earthquake on 11 March 2011 and manages a global open data network for ionizing radiation and air quality monitoring.
In February 2018, Japan renewed the export of fish caught off Fukushima's nearshore zone. According to prefecture officials, no seafood had been found with radiation levels exceeding Japan safety standards since April 2015. In 2018, Thailand was the first country to receive a shipment of fresh fish from Japan's Fukushima prefecture. [163]
TEPCO claimed no significant change in radiation levels, and the smoke subsided later the same day. [40] On 23 March, black smoke billowed from Unit 3, prompting another evacuation of workers from the plant, though Tokyo Electric Power Co. officials said there had been no corresponding spike in radiation at the plant.
Measurements taken by the Japanese government 30–50 km from the plant showed caesium-137 levels high enough to cause concern, [20] leading the government to ban the sale of food grown in the area. Tokyo officials temporarily recommended that tap water should not be used to prepare food for infants.
TEPCO was able to estimate radiation levels of 530 Sv/hr, the highest level measured since the March 2011 accident when the previous high was measured at 73 Sv/hr. [80] [81] [82] This does not represent an increase in radiation at the reactor, but rather is the first measurement taken in the containment vessel at this location. [83]