title: Letter: TLD system for radiotherapy monitoring.
mesh_terms: D003037:Cobalt Radioisotopes; D005459:Fluorides; D008094:Lithium; D011879:Radiotherapy Dosage; D013819:Thermoluminescent Dosimetry
chemical_list: D003037:Cobalt Radioisotopes; D008094:Lithium; D005459:Fluorides