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    Establishment of air kerma reference standard for low dose rate Cs-137 brachytherapy sources

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    Establishment of air kerma ...
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    Genre
    Journal Article
    Date
    2011-01-01
    Author
    Sharma, SD
    Kumar, S
    Srinivasan, P
    Chourasiya, G
    Subject
    Brachytherapy
    Cesium Radioisotopes
    Graphite
    Monte Carlo Method
    Photons
    Radiotherapy Dosage
    Reference Standards
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5527
    
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    DOI
    10.1120/jacmp.v12i4.3553
    Abstract
    A guarded cylindrical graphite ionization chamber of nominal volume 1000 cm3 was designed and fabricated for use as a reference standard for low-dose rate 137Cs brachytherapy sources. The air kerma calibration coefficient (NK) of this ionization chamber was estimated analytically using Burlin's general cavity theory, as well as by the Monte Carlo simulation and validated experimentally using Amersham CDCS-J-type 137Cs reference source. In the analytical method, the NK was calculated for 662 keV gamma rays of 137Cs brachytherapy source. In the Monte Carlo method, the geometry of the measurement setup and physics-related input data of the 137Cs source and the surrounding material were simulated using the Monte Carlo N-Particle code. The photon energy fluence was used to arrive at the reference air kerma rate (RAKR) using mass energy absorption coefficient. The energy deposition rates were used to simulate the value of charge rate in the ionization chamber, and the NK was determined. The analytical and Monte Carlo values of NK of the cylindrical graphite ionization chamber for 137Cs brachytherapy source are in agreement within 1.07%. The deviation of analytical and Monte Carlo values from experimental values of NK is 0.36% and 0.72%, respectively. This agreement validates the analytical value, and establishes this chamber as a reference standard for RAKR or AKS measurement of 137Cs brachytherapy sources.
    Citation to related work
    Wiley
    Has part
    Journal of Applied Clinical Medical Physics
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5509
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