RASHIX
Ceramics that efficiently shield radiation

Mitsuishi Taikarenga Co., Ltd.

Basic knowledge of radiation
Radiation includes α rays, β rays, γ rays, and neutron rays. Of these, αrays and β rays have low penetrating power. For example, α rays can beshielded with a piece of paper and β rays can be shielded with a thinaluminum foil.γ-rays and X-rays are high-energy electromagnetic waves andhave high penetrability, so it is impossible to completely shield them withordinary substances. Lead is well known as a shield against γ rays and X rays.
RASHIX can also efficiently shield γ rays and X rays. On the other hand,theprinciple of shielding nuetron is different. Fast neutrons generated by nuclear
reactions can be decelerated by water and absorbed by boron.

Aluminium foil

RASHIX
LeadWater

Paperalpha-raybeta-raybeta-rayneutronShielding performance
The density of RASHIX is 4.9g/㎝³, which enable to shield radiation effectively.
For example, the penetrating rate though 10 cm of RASHIX for gamma ray emitted
from cesium137 is one sixth of that of concrete. And also, the thickness ofRASHIX can equivalently shield with a half of that of concrete. By halving thethickness of the stracture, land and buildings can be used much more effectively.

MitsuishiTaikarenga co.,ltd

Verification results of shielding performance
As a result of conducting various tests of shielding performance verification at
Tokyo Metropolitan Industrial Technology Center, Okayama University ofScience, and Osaka Prefecture University, high radiation shielding performance
was verified. We also conducted a storage test of radioactive waste in aRASHIX shielding box at a temporary storage site for decontamination waste in
Fukushima Prefecture. As a result of measuring the shielding rate of gamma
rays emitted from cesium137 which is a radioactive waste, the shielding rate of
98.4% was obtained with a shielding thickness of 17 cm, and the shielding
performance of RASHIX was reconfirmed.

Shielding thickness(cm)Use
As X-ray protection in medical facilities and radiation shielding material for
linear accelerators and heavy ion radiotherapy equipment
Ensuring the safety of radiation workers
As an emergency measure in a nuclear power plant or a shelter for workers
Storage container for radioactive waste such as decontamination waste
Nuclear shelter shielding material

MitsuishiTaikarenga co.,ltd

Features
Specific density overturning common sense
It has a density of 4.9 g /㎝³, much heavier than concrete or heavy concrete,
which enables to shield radiation efectively.
Free of harmful substances
Since it does not contain heavy metals such as lead, it can be used withsecurity.
High tolerance agaist agerelated detereoration
Because it's the ceramic manufactured by firing at high temperatures, it isstrong agaisnt aging.
Can be manufactured in any shape
It can be manufactured in a shape that matches the application and design.
High strength
It has a very high strength (compressive strength is 200MPa) andcan build a solid structure.
Excellent in chemical resistance
The RASHIX test samples are soaked in each reagent at room temperatureand leave it for 48 hours. Changes in the dry weight and appearance of thespecimen are shown below.

Reusablility
Since it is a brick, it can be reassembled and reused. It has excellent
economical efficiency.
Mass production is possible
The raw materials for RASHIX can be stably obtained in large quantities.
MitsuishiTaikarenga co.,ltd

Patent
Patented in Japan, USA, China, Korea, Germany

RASHIX regenerates a natural environment where people canlive in peace mind and restores a safe social environment

We have developed ceramics that shield radiation effectively by gahtering ourtechnologies of refractory brick manufacturing cultivated though our longhistory.
Advanced technology and safety of material are required for the treatment ofradioactive wastes contaminated with radioactive materials, the shielding ofradiation in medical facilities and nuclear facilities. RASHIX is a safe productthat does not contain heavy metals such as lead. We have created a highlydense and extremely heavy ceramics, making the most of the original propertiesof ceramics. This high density enable to shield radiation efficiently.
We will continue to challenge ourselves to provide better products, hoping thatpeople around the nuclear power plants, needless to say of people in disasterstriken area, can live in peace and safety,and trying to protect people's healthand safety who treat radiation in any field.

RASHIX is named after Radiation Shielding Ceramics
MitsuishiTaikarenga co.,ltd

Transcript

Measurement of gamma ray shielding rate

Raw material analysis certificate

MitsuishiTaikarenga co.,ltd