steelworks in Wakayama, western Japan, for other radioactive substances because neutrons, which are not emitted by cesium 137
, have been detected.
has begun to develop six food irradiation plants that would use cesium 137
as their gamma ray source.
A spokesman for Washington River Protection Solutions, the Hanford tank farm contractor, said that if the workers did have an "internal uptake" of cesium 137
, it would have been at a very low level
In comparison, no cesium 134 was found in tuna caught in 2008, while a tiny amount of cesium 137
that would naturally exist in the environment was found in them.
The half-life of Iodine 131 is eight days, and for Cesium 137
, 30 years, though both are removed from the atmosphere fairly quickly.
According to the study published Monday, cesium 134 and cesium 137
found in 15 bluefin tuna caught off the coast of San Diego, California, last August measured 4 bequerels per kilogram and 6.