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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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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: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?
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
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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