What is pulse-height detection?
A pulse height analyzer is an instrument used to analyze the frequency distribution of the spectrum of photon energies that are captured by a gamma camera. Energy windows are selected to only allow certain photon energies that fall within a preset range to contribute to the output pulse.
What is pulse-height distribution?
Pulse height distribution data which is defined as the distribution of the energy deposited in detector volume gives some information about the profiles of emitting radiation source. This non-Boltzmann quantity can be calculated by numerical simulation of the radiation interactions in the detector and its environment.
What is resolution of a detector?
The energy resolution (Re) of a detector measures its ability to distinguish gamma-rays with close energies. The better the energy resolution, the better it can separate two adjacent energy peaks, which allows identifying different decays or radionuclides in the spectrum.
What is the sensitivity of a detector?
Sensitivity is the measure of a metal detector’s ability to detect a specific type and size of metal contaminant.
What is detector resolution?
What is the difference between Lod and sensitivity?
Sensitivity and Detection Limit Detection limit, as they state very well in another part of the text, is the lowest detectable level of analyte distinguishable from zero, whereas analytical sensitivity is the slope of the calibration curve.
What is LOQ vs LOD?
The LOD is the lowest analyte concentration that can be distinguished from the assay background, while the LOQ is the lowest concentration at which the analyte can be quantitated at defined levels for imprecision and accuracy (bias) .
What is the CDP pulse height analysis?
The job of the CDP pulse height analysis is to get the best possible estimate of the height of each pulse. To first order, the pulseheight is proportional to the X-ray energy, and the higher-order terms can be calibrated.
How does the location of the sample affect the pulse height?
That is, the samples near the peak of the pulse contribute the most to the calculated pulseheight, and the samples farther from the peak contribute proportionately less. We also have to consider the effect of noise on the resulting pulseheight.
How do you analyze pulses that are too close together?
When pulses are too close even for the Mid-res PHA, they are analyzed by simply measuring the height of the peak over the baseline. The baseline is measured by taking the average of a few (typically 8) samples right before the start of the pulse.