Key Equations
Medical Imaging - OCR A-Level Physics
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$$I = I_0 e^{-\mu x}$$
$$x_{1/2} = \frac{\ln 2}{\mu}$$
$$Z = \rho c$$
$$\frac{I_r}{I_0} = \left(\frac{Z_2 - Z_1}{Z_2 + Z_1}\right)^2$$
$$E = 2m_e c^2$$