In recent years, with the gradual development and maturity of China's scientific research and technology, the radioisotopes and radiation application technology have been developed rapidly, but coming along with the safety problems which caused by radioactive sources. As we all know, radioactive source does great harm to human being’s health and our survival environment. According to the degrees of harms, the radioactive sources can be divided into five categories from high to low. One level is the most harmful class of radioactive sources, radioactive fifth is the smallest. So, what is radioactive resource? Radioactive source is a solid radioactive material that should be permanently sealed in a tight container (except the research reactors and power reactors nuclear fuel cycling). In other words, this harmful solid radioactive material need to be stored in sealed containers, but how to ensure the radioactive sources that won’t leak from this container, it makes the choice of radioactive container become a vital problem.

 

According to the preliminary statistics of authorities, China's existing wasting radioactive sources are about 25,000, and there were 2000 pieces existing in the environment in where the human beings live, and had been out of control, threatened to human health and safety like an invisible bomb.

 

Tungsten alloy (containing tungsten content of 85% to 99%) is a kind of alloy that constituted by adding a small amount of cobalt, nickel, copper, iron elements and so on, it also can be called heavy alloy or high density tungsten alloy. As the name suggests, tungsten alloy has a high density, which making it become the perfect materials for producing radioactive source containers. Because if the material has a high density, it can better prevent the leakage of radioactive source, then it also can eliminate safety hazards and make the radioactive source kept safely in the container.