Journal of Medical Physics

Year
: 1997  |  Volume : 22  |  Issue : 4  |  Page : 169--194

Surface Dose Measurements Using Parallel Plate Markus Chamber For 60co, 6 & 10 MV Photon Beams


HK Malhotra1, DD Deshpande2, SV Salvi3 
1 
2 
3 

Correspondence Address:
HK Malhotra


Fixed volume parallel plate ion chambers are commonly employed for surface dose measurement purposes as the much desired extrapolation chambers are rarely available in a department. They, however, overestimate the surface doses by an appreciable amount, sometimes as much as a factor of 2, and needs careful consideration before using measured data for clinical dosimetry. Surface dose measurements were carried out for 60Co, 6 and 10 MV photon beams using a PTW Markus parallel plate chamber as well as UF TLD powder. The Markus chamber was found to over-response the surface dose measurements by 18.7%, 10.6% and 6.7% in absolute terms for 6 0co, 6 and 10 MV, respectively, which is in conformity with the available literature.


How to cite this article:
Malhotra H, Deshpande D, Salvi S. Surface Dose Measurements Using Parallel Plate Markus Chamber For 60co, 6 & 10 MV Photon Beams.J Med Phys 1997;22:169-194


How to cite this URL:
Malhotra H, Deshpande D, Salvi S. Surface Dose Measurements Using Parallel Plate Markus Chamber For 60co, 6 & 10 MV Photon Beams. J Med Phys [serial online] 1997 [cited 2021 Jan 24 ];22:169-194
Available from: https://www.jmp.org.in/article.asp?issn=0971-6203;year=1997;volume=22;issue=4;spage=169;epage=194;aulast=Malhotra;type=0