Abstract
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.
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献