Document Detail

Investigation of vacuum pumping on the dose response of the MAGAS normoxic polymer gel dosimeter.
MedLine Citation:
PMID:  16060316     Owner:  NLM     Status:  MEDLINE    
The effect of vacuum pumping on the dose response of the MAGAS polymer gel dosimeter has been investigated. A delay of several days post-manufacture before irradiation was previously necessary due to the slow oxygen scavenging of ascorbic acid. The MAGAS polymer gel dosimeter was vacuum pumped before gelation to remove dissolved oxygen. The MAGAS polymer gel dosimeter was poured into glass screw-top vials, which were irradiated at various times, post-manufacture to a range of doses. Magnetic resonance imaging techniques were used to determine the R2-dose response and R2-dose sensitivity of the MAGAS polymer gel. The results were compared with a control batch of MAGAS polymer gel that was not vacuum pumped. It was shown that vacuum pumping on the MAGAS polymer gel solution immediately prior to sealing in glass screw-top vials initially increases the R2-dose response and R2-dose sensitivity of the dosimeter. An increase in the R2-dose response and R2-dose sensitivity was observed with increasing time between manufacture and irradiation. Over the range of post-manufacture irradiation times investigated, the greatest R2-dose response and R2-dose sensitivity occurred at 96 hours.
A J Venning; M L Mather; C Baldock
Related Documents :
16114626 - Evaluation of denitrification potential of rotating biological contactors for treatment...
8877666 - 2 multi-center trials assessing the clinical efficacy of 5% sanguinarine in a biodegrad...
16019386 - Legionella pneumophila associated with the protozoan hartmannella vermiformis in a mode...
299866 - The role of encapsulation and host age in the clearance of haemophilus influenzae bacte...
19489006 - Endogenous cannabinoid signaling is required for voluntary exercise-induced enhancement...
17089846 - Massive-training artificial neural network (mtann) for reduction of false positives in ...
Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article    
Journal Detail:
Title:  Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine     Volume:  28     ISSN:  0158-9938     ISO Abbreviation:  Australas Phys Eng Sci Med     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-08-02     Completed Date:  2005-08-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8208130     Medline TA:  Australas Phys Eng Sci Med     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  105-10     Citation Subset:  IM    
School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Dose-Response Relationship, Radiation
Equipment Failure Analysis
Gels / chemistry,  radiation effects
Methacrylates / chemistry*,  radiation effects*
Oxygen / chemistry*
Polymers / chemistry,  radiation effects
Radiation Dosage
Radiometry / instrumentation*,  methods
Reproducibility of Results
Sensitivity and Specificity
Reg. No./Substance:
0/Gels; 0/Methacrylates; 0/Polymers; 7782-44-7/Oxygen; 79-41-4/methacrylic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Dynamic matrix composition in engineered cartilage with stochastic supplementation of growth factors...
Next Document:  Calibration of the Nuclear Associates 07-621 precision photometer.