Impact of the differential fluence distribution of brachytherapy sources on the spectroscopic dose-rate constant

2015 ◽  
Vol 42 (5) ◽  
pp. 2379-2388
Author(s):  
Martha J. Malin ◽  
Laura J. Bartol ◽  
Larry A. DeWerd
Keyword(s):  
Dose Rate ◽  
Rate Constant

On the dose rate constant of the selectSeed I125 interstitial brachytherapy seed

2006 ◽  
Vol 33 (5) ◽  
pp. 1522-1523 ◽  
Author(s):  
Panagiotis Papagiannis ◽  
Loukas Sakelliou ◽  
Giorgos Anagnostopoulos ◽  
Dimos Baltas
Keyword(s):  
Dose Rate ◽  
Rate Constant ◽  
Interstitial Brachytherapy

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.

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