462
-
TABLES
TABLE 4.—NATURAL GROUPS or ALPHA PARTICLES
'
vo = initial velocity.“ â = initial energy. V0 = initial energy. V'o = initial
kinetic energy
of the recoil atom (V ’
0 = MaVo/M’). R = mean range;
=
‘
extrapolated range; f= total number of ion pairs produced. R, r and
in air
at 760 mm. and 15° C.
'
_
-
'
I
‘
.
.
Radioactive
v/°sec ËrÊs
k‘il:
R
r
j
-
'
‘
cm'
'
'
'
cms.
cms.
105
Substance
10"5X
volts
volts
X
Uranium I......…...
1.420
0.666
4190
71
2.69
2.72
1.20
UraniumIl..…………
1.511
0.755
4740
81
3.24
3.28
.
1.498
0.742
4660
82
3.15
3.19
1.34
Radium (1). .
1.519
0.763
4795
86
3.29
3.33
1.37
Radon.....….………
1.625
0.873
5488
100
4.04
4.08
1.57
Radium A..………
1.699
0.955
6001
112
4.64
4.69
1.72
RadiumC(l)………… 1.628
0.876
5508
105
4.06
4.11
1.58
‘
Radium C'........î”. 1.922
1.222
7683
146
6.87
6.94
-
2.20
Polonium..…
..
..
1.597
0.843
5300
103
3.83
3.87
1.52
Actinoufahium.
.
.
.
.
.
.. 1.511
0.755
4740
82
3.24
3.28
1.36
“
Protoactinium.
. . ..
.
1.569
0.814 '
5115
90
3.63
3.67
1.47
j.
Radioactinium (2). .. 1.701 0.957 6015
108.
4.66
4.71
1.72
_
-
(4). ..
1.663
0.914
5748
103
4.34
4.39
1.65
'
Attinium X (1)… ... . 1659
0.910
5720
,
104
_
1.64 ««
,_
“
Actinon (1).
.
....
‘
1,812
1,086
6826
”
127
_
195
.
_.
.
.
1.884 ; 1.174 , 7382
140
j .: î6…44
…
6.51
'
211 …
*
Ainiumçç (1) ..
14755
1 . 053
6621
128
5 .=42 ,
'
:;‘1….rg90
Act1mumC’ïi;1,.892 ,
_
1«. 184
7445
,
144 i)
6:53
,
:=î 213
Radlothonum(l) 16150862 ‘
5420 '
97
396
4401 155
Thom 1739 1000 6284 116
499 504 180
ThoriumA 1805 1078 6775 128
562 568194
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