Solid geometry versus plane geometry for  252 Cf sources.
D002142:Californium / Q000627:therapeutic use*; D007495:Iridium; D008433:Mathematics; D009369:Neoplasms / Q000532:radiotherapy; D010984:Platinum; D011879:Radiotherapy Dosage
D007495:Iridium; D010984:Platinum; D002142:Californium