Photon spectrometry for the determination of the dose-rate constant of low-energy photon-emitting brachytherapy sources

2007 ◽  
Vol 34 (4) ◽  
pp. 1412-1430 ◽  
Author(s):  
Zhe Jay Chen ◽  
Ravinder Nath
Keyword(s):  
Dose Rate ◽  
Rate Constant ◽  
Low Energy ◽  
Energy Photon

Primary yields and mechanism in the radiolysis of gaseous ammonia

1969 ◽  
Vol 47 (16) ◽  
pp. 3007-3016 ◽  
Author(s):  
C. Willis ◽  
A. W. Boyd ◽  
O. A. Miller
Keyword(s):  
Dose Rate ◽  
Rate Constant ◽  
High Dose Rate ◽  
Radical Reactions ◽  
Gaseous Ammonia ◽  
High Dose ◽  
Ammonia Vapor ◽  
Radical Product ◽  
Very High

Ammonia vapor has been irradiated with single pulses of electrons at a very high dose rate (1027 eV g−1 s−1) with a Febetron 705. At this dose rate radical–product reactions are not significant. In pure ammonia, hydrogen, nitrogen, and hydrazine are produced and the yields found at 1027 eV g−1 s−1 are: G(H2) = 3.58 ± 0.08; G(N2) = 1.00 ± 0.05; G(N2H4) = 0.58 ± 0.05. The yields are independent of pressure from 1 to 5 atm and of temperature between 20 and 200 °C. Above 250 °C the yields of all three products increase significantly and this is due to reaction [1] competing with radical–radical reactions.[Formula: see text]A rate constant for this reaction has been determined,[Formula: see text]Product yields have been measured for ammonia–propene mixtures. These yields have allowed determination of the primary radiation yields GNH = 0.74; [Formula: see text]; GH = 4.8; and G(−NH3) = 5.4.

Determination of palladium by chemical neutron activation analysis using low energy photon spectrometry

1999 ◽  
Vol 240 (3) ◽  
pp. 877-881
Author(s):  
A. G. C. Nair ◽  
A. V. R. Reddy ◽  
R. N. Acharya ◽  
P. P. Burte ◽  
S. B. Manohar
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Low Energy ◽  
Energy Photon

Corrigendum: Experimental determination of the dose rate constant for selected 125I- and 192Ir-brachytherapy sources (2012 Metrologia 49 S219–22)

Metrologia ◽  
2014 ◽  
Vol 51 (1) ◽  
pp. 127-127 ◽  
Author(s):  
Hans-Joachim Selbach ◽  
Markus Bambynek ◽  
Isabelle Aubineau-Lanièce ◽  
Frantisek Gabris ◽  
Antonio Stefano Guerra ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Dose Rate ◽  
Rate Constant

scholarly journals Determination of TG-43 dosimetric parameters for photon emitting brachytherapy sources

2017 ◽  
Author(s):  
A Mozaffari ◽  
M Ghorbani
Keyword(s):  
Monte Carlo ◽  
Dose Rate ◽  
Rate Constant ◽  
Monte Carlo Code ◽  
Treatment Planning Systems ◽  
Radial Dose Function ◽  
Anisotropy Function ◽  
Radial Dose ◽  
Good Agreement

Objective: Brachytherapy sources are widely used for the treatment of cancer. The report of Task Group No. 43 (TG-43) of American Association of Physicists in Medicine is known as the most common method for the determination of dosimetric parameters for brachytherapy sources. The aim of this study is to obtain TG-43 dosimetric parameters for 60Co, 137Cs, 192Ir and 103Pd brachytherapy sources by Monte Carlo simulation. Methods: In this study, 60Co (model Co0.A86), 137Cs (model 6520-67), 192Ir (model BEBIG) and 103Pd (model OptiSeed) brachytherapy sources were simulated using MCNPX Monte Carlo code. To simulate the sources, the exact geometric characterization of each source was defined in Monte Carlo input programs. Dosimetric parameters including air kerma strength, dose rate constant, radial dose function and anisotropy function were calculated for each source. Each input program was run with sufficient number of particle histories. The maximum type A statistical uncertainty in the simulation of the 60Co, 137Cs, 192Ir and 103Pd sources, were equal to 4%, 4%, 3.19% and 6.50%, respectively. Results: The results for dosimetry parameters of dose rate constant, radial dose function and anisotropy function for the 60Co, 137Cs, 192Ir and 103Pd sources in this study demonstrated good agreement with other studies. Conclusion: Based on the good agreement between the results of this study and other studies, the TG-43 results for Co0.A86 60Co, 67-65200 137Cs, BEBIG 192Ir and OptiSeed 103Pd sources are validated and can be used as input data in treatment planning systems (TPSs) and to validate the TPS calculations.

SU-G-201-06: Directional Low-Dose Rate Brachytherapy: Determination of the TG-43 Dose-Rate Constant Analog for a New Pd-103 Source

2016 ◽  
Vol 43 (6Part24) ◽  
pp. 3624-3624
Author(s):  
M Aima ◽  
W Culberson ◽  
C Hammer ◽  
J Micka ◽  
L DeWerd
Keyword(s):  
Dose Rate ◽  
Rate Constant ◽  
Low Dose ◽  
Low Dose Rate ◽  
Low Dose Rate Brachytherapy
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