  The cross sections for the
$^{12}\mathrm{C}(\gamma,\alpha)^{8}\mathrm{Be}\rightarrow 3\alpha$ reaction
have been successfully measured using exclusive coincidence between three
$\alpha$ particles, minimizing Compton background. Sequential breakup
kinematics are evident, and the cross sections are presented as locally
averaged histogram values. Theoretical \textsc{Fresco} CDCC-CRC calculations
reproduce the experimental data, showing that the process involves
electromagnetic coupling to both $^{8}\mathrm{Be}^{0^+}$ and
$^{8}\mathrm{Be}^{2^+}$ states. This study confirms that the
$^{12}\mathrm{C}(\gamma,\alpha)^{8}\mathrm{Be}\rightarrow 3\alpha$ reaction
proceeds via a sequential mechanism, crucial for understanding its significance
in radiotherapy dosimetry.
