A Re-examination of the Yields in the High Dose Rate Radiolysis of Gaseous Ammonia

1971 ◽  
Vol 49 (13) ◽  
pp. 2283-2289 ◽  
Author(s):  
A. W. Boyd ◽  
C. Willis ◽  
O. A. Miller
Keyword(s):  
Dose Rate ◽  
Numerical Integration ◽  
High Dose Rate ◽  
Gaseous Ammonia ◽  
Radical Mechanism ◽  
High Dose ◽  
A Value

Eyre and Smithies have recently obtained radical yields of [Formula: see text] in the radiolysis of gaseous ammonia. The consistency of these with N2, H2, and N2H4 yields obtained in the high dose rate radiolysis of NH3 and NH3–C3H6 mixtures has been shown by numerical integration of the rate expressions in a simple radical mechanism. These calculations give a value of 2.1 ± 0.5 × 1010 M−1 s−1 for the reaction of H atoms and NH2 radicals and a ratio of recombination to disproportionation of 6:1.

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.

NCS Report 7: Recommendations for the calibration of Iridium-192 high dose rate sources

1994 ◽  
Author(s):  
J.L.M. Venselaar ◽  
A.H.L. Aalbers ◽  
W.F.M. Brouwer ◽  
H. Meertens ◽  
J.J. Petersen ◽  
...  
Keyword(s):  
Dose Rate ◽  
High Dose Rate ◽  
High Dose ◽  
Iridium 192
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