Abstract
Assuming
G
(Fe
3+
) =12.7 for aerated, acidified ferrous sulphate solutions, the following values have been measured (a)
G
(O
2
)Fe
2+
, Cu
2+
= 0,
G
(H
2
)Fe
2+
Cu
2+
= 0.51 ± 0.03,
G
(Fe
3+
)Cu
2+
= 1.06 ± 0.03 for the ferrous-cupric system, (
b
)
G
(Ce
3+
) = 2.84 ± 0.05 for acidified solutions of ceric sulphate (
c
)
G
Ce
3+
)
T1+
= 7.30 ± 0.025 for the ceric-thallous system (
d
)
G
(H
2
O
2
)
i
= 1.03 + 0.06 for aerated 0.1N sulphuric acid and (
e
)
G
(H
2
) = 0.935 ± 0.09 for 0.1N sulphuric acid and 0.607 ± 0.06 when 4 x 10
-5
M H
2
O
2
is also present. The equation
G
(Fe
3+
)
β+λ
= 12.7
x
+ 15.5(1−
x
), where
x
is the fraction of the total energy absorbed provided by
β
-particles, is valid for
x
= 0 to1. The following quantities are deduced:
G
H
= 2.91 ± 0.01,
G
H
2
O
2
= 0.97 ± 0.02,
G
OH
= 2.00 ± 0.08,
G
H
2
= 0.53 ± 0.05
5
and
G
-H
2
O
= 3.97 ± 0.12. The predicted value for
G
(Fe
3+
)
-O
2
= 6.87 ± 0.13 is not attained unless [Fe
2+
] ≥ 10
-3
M and [H
2
SO
4
] ≥ 0.8N. These results are discussed and it is concluded that, contrary to earlier views, the primary process in
T β
-irradiation is closer to that of
60
Co
γ
-rays than that of
α
-particles.
Cited by
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