Aspects of the Radiation Chemistry of Fluid and Rigid Aqueous Solutions Containing Nitrous Oxide and Ferrous Ions

1962 ◽  
Vol 17 (3) ◽  
pp. 388 ◽  
Author(s):  
F. S. Dainton ◽  
F. T. Jones
Keyword(s):  
Nitrous Oxide ◽  
Aqueous Solutions ◽  
Radiation Chemistry ◽  
Ferrous Ions

The radiation chemistry of aqueous solutions of nitrous oxide

1965 ◽  
Vol 285 (1402) ◽  
pp. 339-359 ◽  
Keyword(s):  
Nitrous Oxide ◽  
Steady State ◽  
Aqueous Solutions ◽  
Dose Rate ◽  
Radiation Chemistry ◽  
Bimolecular Reaction ◽  
Unimolecular Decomposition ◽  
Solvated Electron ◽  
Concentrated Aqueous Solutions ◽  
Dose Effects

For carefully purified concentrated aqueous solutions of N 2 0, G (N 2 ) is initially greater than the steady state value of 3.0 and G (O 2 ) less than the steady state value of 1.45 when G (H 2 ) = G (H 2 O 2 ) = 0. For very dilute solutions G (N 2 ) is small, independent of dose rate and decreases with increasing dose and decreasing [N 2 O], while G (H 2 ) is initially > 0.45, independent of dose rate and decreases with dose. The high initial G (H 2 is not due to organic or other impurity and is thought to arise either from bimolecular reaction of e aq − . and H within a spur or track or from unimolecular decomposition of the solvated electron either to H 2 + O - or H + OH - or from a combination of both. The dose effects are attributed to competitive scavenging of e aq − . by H 2 O 2 as the latter is produced.

The radiation chemistry of aqueous solutions - I. The effect of changing linear energy transfer along a polonium α -particle track

1962 ◽  
Vol 265 (1323) ◽  
pp. 407-421 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Sulphuric Acid ◽  
Hydroxyl Radicals ◽  
Chemical Change ◽  
Radiation Chemistry ◽  
Track Length ◽  
Particle Track ◽  
Ferrous Ions ◽  
Ceric Sulphate ◽  
Local Value

Absolute G values for chemical change when various aqueous solutions are irradiated with α -particles from an external polonium source have been determined for different fractions ( x ) of the α -particle track spent within the solution. G(Fe 3+ ) for an aerated solution containing 1 mM ferrous ions and 0.1N sulphuric acid decreases from 5.0 at x =0.02 through a minimum value 3.65 at 0.11 x 0.01 and then increases to 5.94 at x = 0.525. The local value G(Fe 3+ ), defined as G(Fe 3+ ) for an element of track length a distance x R from the end of the track, where R is the range of the whole track in water, shows a similar but more pronounced dependence on x which is strongly reminiscent of the inverted Bragg curve for l. e. t. plotted against x in this medium, having a minimum of 3.2 5 ± 0.1 5 at x= 0.085±0.015. As x is increased G(Ce 3+ ) for an aerated 200 μM solution of ceric sulphate in 0.1 N sulphuric acid shows no minimum but increases from 1.0 at x =0.04 to 3.0 at x=0.25 and 4. 05 at x = 0.525. Thallous ions have no effect on G(Ce 3+ ) for x ≤ 0.45. G(H 2 O 2 ) for aerated water was found to be 1.22 ±0.06. It is concluded that very few hydroxyl radicals are available and that the intra-track reactions between H 2 O 2 and H as well as OH are very important and vary in extent as x is varied.

Sign in / Sign up

Export Citation Format

Share Document