BUSINESS GUIDE
Nuclear Power Related Equipment × RASHIXAs a shielding wall for radiation
To Protect Workers in a Radioactive Environment
In the past, substances with a large specific gravity were effective as radiation shielding material,
and materials containing lead were mainly used.
Lead is known to be harmful to the human body and the global environment,
more so, that it became unusable in recent years, and concrete and iron are now used instead.
However, the shielding of concrete and iron has drawbacks for their increase in size and magnetization.
Therefore, as radiation countermeasures against accidents at Fukushima I Nuclear Power Plant,
we developed a radiation shielding ceramic named RASHIX.
RASHIX is a radiation shielding ceramic that was created and
has the density of 4.9g/㎤ which overturns common knowledge by using our original sintering technology.
We have succeeded in manufacturing the original form of ceramics and to freely form its shape.
In the Great East Japan earthquake accident, during the handling effort of the Fukushima I Nuclear Power Plant,
we shielded gamma rays from the waste using a RASHIX shielding box as temporary storage of
decontamination waste in Fukushima Prefecture and measured the decrease in radiation doses.
The result was a shielding rate of 98.47% at a thickness of 17 cm, and shielding performance of RASHIX was confirmed.
Excellent Shielding Performance of "RASHIX"
RASHIX is a safe product that does not contain heavy metals such as lead. We made full use of the original properties that ceramics possess, and were able to create a high density and very heavy ceramic.
It isn’t affected by age deterioration, it’s high in strength and excellent in chemical resistance, so you can use it with confidence with the assurance of safety.
The shielding property from radiation in RASHIX has been confirmed to be of high performance as a result of conducting verification tests at Tokyo Metropolitan Industrial Technology Research Institute, Okayama University of Science, and Osaka Prefecture University in various ways.
RASHIX has a density of 4.9g/㎤, and it can efficiently shield radiation.
For example, RASHIX can be reduced to one-sixth of that of standard concrete when comparing the transmittance of gamma rays emitted from radioactive cesium 137 using the same length (10 cm) of RASHIX and concrete.
Also, if RASHIX has the same transmittance as concrete, it can be used at about half the thickness of standard concrete. By cutting the thickness in half for the structure, you can effectively use it on land and buildings.
Examples of Constructions
1) Ehime Prefecture Nishiuwa District / Ikata Government Nuclear Disaster Countermeasure Facility
2) Kashima District Nuclear Disaster Countermeasure Facility