GB/T 45661-2025Determination for dangerous quantities of radioactive material (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed and coordinated by the National Nuclear Energy Standardization Technical Committee (SAC/TC58).

This document was drafted by: China Institute of Radiation Protection and China General Hospital of Nuclear Industry.

The main drafters of this document are: Zhang Jiangang, Li Guoqiang, Yang Yapeng, Sun Hongchao, Feng Zongyang, Jia Linsheng, Liu Yulong, Wang Ning and Liang Boning.

Determination of the Dangerous Quantity of Radioactive Substances

1 Scope

This document gives the exposure scenarios and exposure pathways, health effects, radioactive substances and their impact on the health of the individual.

Quality characteristics, as well as D value and its application.

This document applies to the determination of hazardous quantities of radioactive materials during nuclear and radiation emergency preparedness.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document.

4 Exposure scenarios and exposure pathways

4.1 Determination of D value When considering the exposure scenario, radioactive materials are divided into two categories. one is non-diffusible material (D value is recorded as D1), and the other is The substance is a diffuse substance (D value is recorded as D2). The specific meaning is as follows.

a) The D1 value is the activity of the radionuclide in the non-dispersible material. If the source is out of control but there is no dispersion, the radionuclide can Can lead to an emergency situation and is expected to cause serious deterministic effects;

b) The D2 value is the activity of radionuclides in the diffuse material. If the source is out of control and diffuses, it may lead to an emergency state and is expected to cause serious consequences. re-determination effect;