How are radioactive sources classified?

Release time:

2021-05-27

Radioactive sources refer to radioactive materials that are permanently sealed in the cladding or tightly bonded in the covering layer and are in the solid state, except for materials in the nuclear fuel cycle of research reactors and power reactors.

According to the potential hazards of radioactive sources to human health and the environment, radioactive sources are divided into Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ from high to low, and the lower limit of the activity of Ⅴ source is the exempt activity of the species.

Class I radioactive sources are extremely dangerous radioactive sources. Without protection, exposure to these sources can cause death within a few minutes to an hour;

Class II radioactive sources are high-risk sources. Without protection, exposure to these sources for a few hours to a few days can lead to death;

Class III radioactive sources are hazardous sources. Without protection, exposure to these sources can cause permanent harm to a person within a few hours, and exposure for a few days to a few weeks can lead to death;

Class IV radioactive sources are low-risk sources. Basically does not cause permanent damage to people, but may cause recoverable temporary damage to people exposed to these radioactive sources for a long time and close to them;

Class V radioactive sources are extremely low hazard sources. It is unlikely to cause permanent damage to people.

According to the Maximum Daily Equivalent Workload of Radionuclides (GB 18871~2002), non-confined source workplaces are divided into Class A, Class B and Class C.

Safety management of Class A premises refers to Class I sources.

Class B and C sites refer to class II and III sources.

Radiation protection methods

What is the difference between a radioactive source and a radioactive source?

Radiation protection methods

What is the difference between a radioactive source and a radioactive source?