An earlier report in another facility said one of them showed a high level of contamination in the lungs.
The accident took place last week at a research facility of the Japan Atomic Energy Agency in Ibaraki Prefecture, north of Tokyo.
The agency said it measured as much as 22,000 becquerels of plutonium-239 in the lungs of one of the workers after powdered radioactive materials scattered in a room.
The workers were sent to the National Institute of Radiological Sciences.
Officials at the institute told reporters on Monday that they had conducted up to 4 examinations of the lungs of the 5 workers. No plutonium was detected.
They also said they detected another radioactive substance called Americium. But they did not disclose how much of the substance was found or from how many of the workers. They pointed out that Americium can be created after plutonium undergoes nuclear fission.
An institute in Japan treating 5 workers exposed to radioactive substances says it has not detected plutonium in any of their lungs. (NHK)
Two hikers in their 60s were found dead Monday on a mountain on the island of Yakushima in Kagoshima Prefecture, police said. (Japan Times)
Airbnb has made its TV branding debut in Japan following the implementation of a law on Friday 9 June that recognises home sharing in the country and sets out clear rules for it. (campaignasia.com)
Bitcoin, the world’s foremost digital currency, is a hot topic in Japanese FinTech circles right now. Until recently, Japan has been seen to lag behind its Asian counterparts when it comes to virtual currency initiatives. Whereas China and South Korea are moving fast toward becoming cashless societies, with over 50% of payments processed electronically, Japan has been comparatively slow to respond, with an adoption rate currently pegged at around 19%. (newsonjapan.com)
A giant panda cub was born in a Tokyo zoo Monday, but its gender, weight and even whether it will survive are uncertain. (Japan Today)
Japanese consumers bought more beer and similar beverages in May ahead of an expected price hike. (NHK)
A freak car accident on an Aichi highway is captured in frightening detail. (rocketnews24.com)
The manager of an adult entertainment business was stabbed by a man who then apparently jumped to his death in Tokyo’s Ikebukuro area, police said Sunday. (Japan Today)
A proposed ban on indoor smoking is likely to be postponed, as the health ministry and the ruling Liberal Democratic Party could not work out their differences in time to submit a bill in the current Diet session. (NHK)
A high school boy in Miyagi Prefecture went missing at sea Sunday after waves swept him and a friend from their dinghy while they were trying to return to shore, police said. (Japan Today)