Loading…

Use of High Pressure Ionisation Chambers and a Comparison with TEPCs for Obtaining Microdosimetric Information in Unspecified Radiation Fields

Improved and detailed theoretical treatment of initial recombination of ions in tissue-equivalent (TE) high pressure ionisation chambers has recently demonstrated the potential of such instruments to measure accurately radiation quality average parameters in unspecified radiation fields. This paper...

Full description

Saved in:
Bibliographic Details
Published in:Radiation protection dosimetry 1989-10, Vol.29 (1-2), p.15-19
Main Authors: Makrigiorgos, G.M., Waker, A.J., Kassis, A.I.
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Improved and detailed theoretical treatment of initial recombination of ions in tissue-equivalent (TE) high pressure ionisation chambers has recently demonstrated the potential of such instruments to measure accurately radiation quality average parameters in unspecified radiation fields. This paper presents an experimental testing of the high pressure ionisation chamber method and a comparison with low pressure proportional counters (TEPC). The restricted dose mean LET (_500,D) of 22 to 150 kVp diagnostic X rays is measured with the high pressure ionisation chamber and compared to yD values derived with the proportional counter. At the higher X ray energies (>60 kVp), both methods show the same result, namely that the _500,D and the yD remain relatively constant as a function of energy. At the lower X ray energies usually employed in mammographic procedures (
ISSN:0144-8420
1742-3406
DOI:10.1093/oxfordjournals.rpd.a080523