Assuming a narrow beam geometry in which the scattered radiation dose not reach the detector, the transmission of photons/neutrons through an object of density ρ (g/cm3) and thickness X can be calculated using the attenuation relation:
Assuming a narrow beam geometry in which the scattered radiation dose not reach thedetector, the transmission of photons/neutrons through an object of density ρ (g/cm3) and thicknessX can be calculated using the attenuation relation: