CONTENTS (Continued)
CHAPTER 4
4.1
4.2
4.3
4.4
4.5
Particle-size Distribution, Radioactive
4.4.1 Particle-size Distribution as a Function of Time
4.4.2 Particle-size Distribution as a Function of Distance
Time of Arrival of Particulate .
4.5.1 Arrival of Fall-out .
4.5.2 Duration of Fall-out
.
4.5.3 Distribution of Activity with Time .
48
Distribution of SecondaryFall-out
Levels of Radioactivity
Period of Secondary Fall-out
Particle Size of Secondary Fall-out
48
48
48
48
METEOROLOGICAL CONSIDERATIONS AND
FORECASTS OF FALL-OUT
,
.
SUMMARY
54
54
54
55
55
Conclusions
7.1.1 Primary Fall-out
Secondary Fall-out
Recommendations
57
APPENDIX A EXPERIMENTAL PROCEDURE
A.1
A.2
A.3
Analysis of the Total-collector Samples
Analysis of the Gum-paper Samples .
Analysis of the Differential Fall-out Samples
A.5
A.6
Analysis of the Leached Activity
.
Radiochemical Analysis of Selected Samples
A.4
A.7
Chemical Analysis of Fall-out Samples
lon-exchange-collector Analysis
51
51
51
53
53
Theories of Fall-out Mechanism
Primary Fall-out
Secondary Fall-out .
:
The Effect of Vertical Mixing
7.1.2
7.2
33
35
35
35
39
41
41
41
41
41
41
47
47
47
SECONDARY FALL-OUT
CHAPTER 7
7.1
33
Physical and Chemical Nature of the Fall-out
4.2.1 Physical Description of Particulate
4.2.2 Chemical Composition of the Particulate
4.2.3 Leaching of Activity
.
4.2.4 Decay of Activity
.
Physical Distribution of Fall-out
CHAPTER 6
6.1
6.2
6.3
6.4
PRIMARY FALL-OUT
Gamma Field
CHAPTER 5
§.1
5.2
5.3
5.4
Page
.
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57
57
58
58
58
58