GB/T 16145-2022Gamma-ray spectrometry method for the determination of radionuclides in environmental and biological samples (English PDF)

3.1 environmental sample

The basic link of the environmental system, the basic unit of the environmental structure.

Note. The environmental samples referred to in this document include water, air, soil, rocks, etc.

3.2 biological sample

Representative biological substances collected according to the requirements of bioradiation detection and used as test samples.

Note. The biological samples referred to in this document include food crops, fruits and vegetables, tea, grass, milk, mushrooms, livestock, poultry, indicative wild animals and plants and other terrestrial animals and plants

Fish, shrimp, crab, algae and other aquatic organisms in sea or fresh water, as well as human and animal hair, tissue, blood and excrement, etc.

3.3 energy calibration

The process of determining the corresponding relationship between the gamma ray energy of the gamma spectrometer system and the track site.

3.4

For a given measurement condition and gamma-ray energy, the net counts within the detected full-energy peak are comparable to those emitted by the radiation source during the same time interval.

The ratio of the total number of gamma photons of this energy.

3.5

Under the given measurement conditions, establish the relationship curve between gamma-ray energy and its all-energy peak efficiency, or determine some specific nuclide calibration coefficients.

3.6 radioactive aerosol

Dispersion system formed by solid or liquid radioactive particles suspended in air or gaseous medium.

3.7 Detection limit detection limit; DL

The lowest activity that can be detected by a spectrometer at a given confidence level.