Determining the effective atomic number (Zeff) using dual-channel X-ray luggage scanner output requires additional information and analysis. The dual-channel X-ray scanners typically consist of two detectors that measure the transmitted X-ray intensities through the object being scanned.
To calculate the effective atomic number, you would typically need the following information:
X-ray energy: The X-ray energy used by the scanner is essential. Different X-ray energies interact differently with various elements, and the choice of energy affects the accuracy of the Zeff determination.
Calibration: A calibration process is required to establish a relationship between the measured transmitted intensities and the effective atomic numbers. This calibration involves scanning objects with known compositions and measuring their transmitted intensities.
Reference materials: It is necessary to have reference materials with known effective atomic numbers to compare the measured transmitted intensities from the object being scanned.
By comparing the transmitted intensities of the unknown object with the reference materials and using the calibration data, you can estimate the effective atomic number of the object being scanned.
However, it is important to note that the specific methodology for calculating Zeff using dual-channel X-ray scanners may vary depending on the manufacturer and specific scanner design. The best approach would be to consult the user manual or documentation provided by the scanner manufacturer for detailed instructions on how to calculate the effective atomic number using their specific device.