If the radiation dose rate from Cobalt-60 at a distance of 5 centimeters from a small source is 760 mRem per day, at what distance will exposure be reduced by half?
If the radiation dose rate from Cobalt-60 at a distance of 5 centimeters from a small source is 760 mRem per day, at what distance will exposure be reduced by half?
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Transcribed Image Text:If the radiation dose rate from Cobalt-60 at a distance of 5 centimeters from
a small source is 760 mRem per day, at what distance will exposure be
reduced by half?
Transcribed Image Text:Energies in Million Electron Volts (MeV)
to
Radionuclide
Half Life
to
Americium-241
458 Y
5.49, 5.44
0.060
1.3
Calcium-47
Carbon - 14
Cesium - 137
0.67, 1.98
0.156
4.54 D
5,730 Y
30.1 Y
27.7 D
271 D
1.18, 0.514
0.662
Chromium-51
0.32
Cobalt - 57
Cobalt - 60
0.122
0.318, 1.48
0.571,(B+ 0.657)
(B+ 0.635)
0.962
5.27 Y
1.17, 1.33
Сopper-64
12.7 H
0.511
Fluorine - 18
Gold - 198
Hydrogen - 3
Indium - 111
Iodine - 125
Iodine - 131
Iridium - 192
Iron - 59
Krypton - 85
Lead - 210
Mercury - 197
Mercury - 203
Nickel - 63
Phosphorous - 32
Potassium - 42
109.8 M
2.696 D
0.412
12.3 Y
0.0196
0.172, 0.247
0.035
0.080, 0.284
0.296 - 0.612
2.83 D
60.2 D
8.04 D
0.607,
0.81
74 D
0.67
0.273, 0.475
0.67
1.1, 1.29
0.517
44.6 D
10.7 Y
22.3 Y
0.017
0.047
64.1 H
0.077
46.8 D
0.214
0.279
92 Y
14.3 D
0.067
1.71
12.4 H
3.52
1.52
Radium - 226
Radon - 222
1,602 Y
3.824 D
4.78, 4.60
5.49
0.187
0.510
0.136 - 0.401
1.39, 2.75
Selenium - 75
118.5 D
Sodium - 24
Strontium - 90
15.02 H
28.8 Y
1.39, 4.17
0.546
0.167
Sulfur - 35
Technetium - 99
Thallium - 201
Uranium - 238
87.5 D
6.02 H
0.141
73 H
4.5 x 109 Y
0.135, 0.167
0.048
0.081
4.19, 4.20
Xenon - 133
5.25 D
0.346
Ytterbium - 169
32.0 D
0.063 - 0.308
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