Chemistry Reference
In-Depth Information
(c) The [
38
Cl]-surface activity deposited at the surface is, to a great extent, strongly bound.
It is located also within the 'bulk solid'; this location is not detected by the counters
due to self-absorption of the b
emitter, [
36
Cl] but its existence is inferred by the
surface count behaviour following removal of radioactive vapour and weakly bound
[
36
Cl] species.
Possible ways of formulating the adsorbed states of H
36
Cl are discussed below (in
Section 4.4.4).
26
000
(a)
24
000
22
000
20
000
18
000
16
000
14
000
12
000
10
000
0
2
4
6
8
10
count No. 1-8 (3.3 kPa), 9,10 after gas removal
95
000
90
000
(b)
85
000
80
000
75
000
70
000
0
2
4
6
8
10
count No. 1-8 (2.7 kPa), 9,10 (after gas removal)
Figure 4.17 Comparisons among [
36
Cl] surface counts fromH
36
Cl aliquots in contact with (a)
high surface area (HS) MgF
2
and (b) 15 mol% HS-FeF
3
in HS-MgF
2
. Line breaks correspond to
the removal of the last aliquot of gas. (Reprinted with permission from M. Nickkho-Amiry,
G. Eltanany, S. Wuttke, S. R¨diger, E. Kemnitz and J.M. Winfield, J. Fluorine Chem., 129,
366-375 Copyright (2008) Elsevier Ltd.)
