Determination of HVLs for Common Building Materials in Sudan

Abstract

8 Abstract This Study was performed to evaluate the Half Value Layer for different building materials. In this study evaluate the response of different building material use in Sudan to build the X-ray room. Used five different building materials with different thickness, and used different KVps and mAs. After exposure has been done and read the output of the machine before put the thickness and read the output after put the thickness and shows the different between the output thickness before and after thickness. From this reading got the attenuation coefficient (μ), and after that the HVL for different building material.  The data reveals that: the system output has been increases with increment of KVps and mAs in a linear form based to this equation: y , where x refers to KVps and y refers to output in μGy generally.  The data reveals that: the exit dose has been increases with increment of KVps and mAs as well, while the exit dose being decreases with the barrier thickness increment from based to this equation where x refers to KVps and y refers to exit dose in μGy for brick.9  The data reveals that: HVLs reduce the intensity of narrow beam of x-radiation to one half of it original value. The HVL is measure of the penetrating power of effective energy of the beam. More precisely the Linear attenuation coefficient measures the probability that a photon interacts (i.e. is absorbed or scatter) per unit length of the path it travels in a specified material from based to this equation, x refers to KVps and y refers to HVL in cm for brick.