Radiation risk estimation based on activity measurements of zirconium oxide implants

✍ Scribed by Porstend�rfer, J. ;Reineking, A. ;Willert, H.-G.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 393 KB
• Volume: 32
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/(sici)1097-4636(199612)32:4<663::aid-jbm20>3.0.co;2-d

✦ Synopsis

Implants made from zirconium dioxide exhibit higher specific radionuclide activities of the uranium-radium and thorium series than metallic and alumium implants. This study presents data on activity measurements performed on different samples of Zr02 raw material (powder) and on the ceramic joint heads belonging to it to formulate a correlation between the specific radionuclide activities of the uraniumradium and thorium series in the raw material, the flux den-sity of the a particle leaving the implant surface, and the annual dose of the tissue surrounding the implant. Based on this experimental study, an equation for defining the limits of the specific activities in raw material is proposed, taking into account the long-lived radionuclides (key nuclides) of the uranium-radium and thorium series weighted with their relative dose contributions from a emitters. 0