@article{oai:repo.qst.go.jp:00043552,
 author = {Tajiri, Minoru and Sunaoka, Masayoshi and Fukumura, Akifumi and Endo, Masahiro and 田尻 稔 and 砂岡 正良 and 福村 明史 and 遠藤 真広},
 issue = {11},
 journal = {Medical Physics},
 month = {Nov},
 note = {In recent years, lead has been recognized as a source of environmental pollution; this includes lead use for radiation shielding in radiotherapy. We looked for a new material which could be a lead substitute. We chose a material composed of tungsten and resin. We compared attenuation coefficient of the material with those of lead and Lipowitz's metal, and found the material had a higher attenuation coefficient than the other two had. The material may be used as a substitute for lead because it is easy to fabricate and friendly to the environment.},
 pages = {3022--3023},
 title = {A new radiation shielding block material for radiation therapy},
 volume = {31},
 year = {2004}
}