title: [Shielding property of different prosthetic materials to shield radiation of (125)I seed].
abstract: OBJECTIVE
  To investigation the shielding property to (125)I of several different prosthetic materials used in clinical when prostheses are used as carriers of (125)I seed in tumor treatment.
  
  
  METHODS
  (125)I seeds were taken as the radiation sources to establish a model in vitro and the radiation doses were measured by thermoluminescent dosemeters (TLD). The shielding property of titanium plate, cochrome plate, and poly methyl methacrylate (PMMA) plate were detected, calculated and compared with that of plumbum plate in the control group.
  
  
  RESULTS
  The radiation doses of the radiation source at 10 mm distance through the following materials were measured, and the results are 2.805 mGy (0.09 mm thick titanium plate), 1.082 mGy (0.48 thick titanium plate), 0.390 mGy (0.41 mm thick cochrome plate), and 0.261 mGy (0.67 mm's cochrome plate), and 2.885 mGy (1.685 mm thick PMMA plate).
  
  
  CONCLUSIONS
  The shield property of cochrome is optimal. The poly methyl methacrylate behaves to some extend as a shield to the (125)I seed which can shield the radiation as the effects of plumbum when adopted together with the 0.557 mm's (or more) titanium plate.
authors.affiliation: Institute of Stomatology, Chinese PLA General Hospital, Beijing, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Bai
authors.forename: Yan-yi
authors.initials: YY
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Rong-fa
authors.initials: RF
authors.lastname: Bu
mesh_terms: D001918:Brachytherapy; D002857:Chromium / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003764:Dental Materials; D017266:Dental Prosthesis; D007457:Iodine Radioisotopes; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011482:Protective Devices; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation*; D013819:Thermoluminescent Dosimetry; D014025:Titanium / Q000737:chemistry
chemical_list: D003764:Dental Materials; D007457:Iodine Radioisotopes; D002857:Chromium; D003035:Cobalt; D019904:Polymethyl Methacrylate; D014025:Titanium