Document Details

Document Type : Article In Journal 
Document Title :
Measurement of photon mass-energy absorption coefficients of paraffin wax and gypsum at 662keV
قياس معاملات امتصاص الفوتون الشامل للطاقة من شمع البارافين والجبس في معدل طاقة مقدارها 662 كيلوالكترون فولت
 
Subject : Radiation Dosimetry 
Document Language : English 
Abstract : One of the most important gamma radiation quantities in respect of radiation dosimetry and health physics applications concerns is mass energy absorption. Direct measurements of the coefficient of mass-energy absorption, (en/), are difficult and typically recourse is taken to theoretical computations. In this study we have determined (en/) experimentally using a simple and direct method based on paraxial sphere transmission using a proportional response gamma detector. The effects of nonparaxiality and of finite sample thickness have been accounted for, using extrapolation procedures. The deviation from nonproportionality and other corrections have been shown to be small. For 662 keV photons, the measured value of (en/) for paraffin wax has been determined using the above method as (3.37  0.05)  10-3 m2/kg. This compares favorably with the theoretically computed value of 3.35  10-3 m2/kg given by Hubbell and Seltzer (1982). The measured value of (en/) for gypsum has been determined as (2.96  0.01)  10-3 m2/kg which also compares favorably with the theoretically computed value of 2.99  10-3 m2/kg given by Hubbell and Seltzer (1982). An extensive study where measurements using spherical shells were compared with those using cylindrical shells were also made, the intent being to determine the equivalence of these two phantom shapes. Besides the question of sensitivity of measurements to shell thickness, the investigation also examined the dependency of measured values on source to detector separation. Results obtained for the two shapes show close agreement with regard the values of (en/) obtained using either shape. 
ISSN : 0969-806X 
Journal Name : Int. Journal of Radiation Physics and Chemistry 
Volume : 68 
Issue Number : 5 
Publishing Year : 1424 AH
2003 AD 
Article Type : Article 
Added Date : Saturday, March 17, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
بسام زهدي الشخريتShakhreet, Bassam ZuhdiInvestigatorDoctoratedr.shakhreet@yahoo.com

Files

File NameTypeDescription
 32730.pdf pdf 

Back To Researches Page