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Regional Basic Professional Training Course in Korea

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❙ 111 ❙<br />

2. Radiation Protection<br />

attenuated.<br />

2. The smaller the atomic number and the less dense the material compos<strong>in</strong>g the barrier,<br />

the less likely it is to attenuate the photons.<br />

Fig. (2.15) Half‐Value Layer(HVL):(a) A barrier of thickness “t” stops a number of photons<br />

consistent with the l<strong>in</strong>ear attenuation coefficient

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