GB/T 39867-2021Bismuth germanate scintillation crystal for positron emission tomography (English PDF)

3.1 Totalenergypeak

In X or gamma radiation measurement, it is equivalent to the peak of the energy spectrum response curve when the energy of the photon in the probe material is all absorbed.

Note: Rewrite the definition 3.1.20 of GB/T 12564-2008.

3.2 Pulse amplitude

When the photocathode is repeatedly irradiated with a light pulse of a certain intensity, the average amplitude of the anode output pulse is generally corresponding to the peak value of the amplitude distribution curve The pulse amplitude is expressed. The input signal is single-energy X or gamma radiation, which is the pulse amplitude corresponding to the peak-to-peak value of the all-energy. [GB/T 12564-2008, definition 3.3.1]

3.3 Optical transmittance

The percentage of the luminous flux passing through the crystal to the luminous flux of the incident crystal.

3.4 Relative light output

Under the same measurement conditions, the ratio of the pulse amplitude output by the measured scintillator to the pulse amplitude output by the scintillator reference sample.

3.5 Energy resolution

For a given energy, the measure of the smallest relative difference between the energy of two particles that can be resolved.

Note 1.In general applications, the energy resolution is the ratio of the half-height width of the peak of the single-energy particle energy distribution curve measured by a spectrometer to the energy corresponding to the peak position, when When energy is expressed by pulse amplitude, its ratio is the pulse amplitude resolution.

Note 2.Rewrite the definition 3.1.16 of GB/T 13182-2007.

3.6 Radiation damage

The degree of decrease in light output before and after the scintillation crystal is irradiated by ionizing radiation (X or gamma rays).