A patient has a lateral separation of 24 cm and is treated w…

A patient has a lateral separation of 24 cm and is treated with opposed right and left lateral photon beams. A total dose of 3600 cGy is prescribed to midline. The beams are weighted 2:1 (right:left). The percentage depth dose (PDD) at 12 cm depth is 0.621. What is the given dose delivered to the left side (at Dmax)?