title: Effect of shadow trays on surface dose and build-up for megavoltage radiation.
mesh_terms: D003036:Cobalt Isotopes; D005374:Filtration; D005459:Fluorides; D007854:Lead; D008094:Lithium; D008961:Models, Structural; D010969:Plastics; D011867:Radioisotope Teletherapy / Q000295:instrumentation; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*
chemical_list: D003036:Cobalt Isotopes; D010969:Plastics; D007854:Lead; D008094:Lithium; D005459:Fluorides