On 13 October 2011, elevated levels of radiation were detected in a residential area of Tokyo, Japan. The source of radiation was found in the basement of a nearby house, where bottles with Ra-226 were being stored. Japanese officials said that the material had been used in making luminescent watch dials. The bottles have been removed for storage in a specialized facility [1,2].
Abstract Number: 20110190
Headline: Bottles with Ra-226 Discovered in Tokyo's Home
Date: 13 October 2011
 "'Tokyo radiation hotspot "hot linked to Fukushima'," BBC News, 13 October 2011, www.bbc.co.uk
 "Old Radium bottles blames for Tokyo's radiation," The Telegraph, 14 October 2011, www.telegraph.co.uk