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25 Cards in this Set
- Front
- Back
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What units are all considered equivalent
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Roentgen, Rad and Rem can all be considered equivalent (as long as there is no quality factor or modifying factor)
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What are the common units of roetgens
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The roentgen measures the energy produced by gamma radiation in a cubic centimeter of air. It is usually abbreviated with the capital letter "R". A milliroentgen, or "mR", is equal to one one-thousandth of a roentgen. An exposure of 50 roentgens would be written "50 R".
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What are rads
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Radiation Absorbed Dose recognizes that different materials that receive the same exposure may not absorb the same amount of energy. A rad measures the amount of radiation energy transferred to some mass of material, typically humans. One roentgen of gamma radiation exposure results in about one rad of absorbed dose.
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What are rem
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Roentgen Equivalent Man is a unit that relates the dose of any radiation to the biological effect of that dose. To relate the absorbed dose of specific types of radiation to their biological effect, a "quality factor" must be multiplied by the dose in rad, which then shows the dose in rems. For gamma rays and beta particles, 1 rad of exposure results in 1 rem of dose.
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Sample conversion
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simple math: put the known units opposite each other with the unknown on the bottom left then cross out. What ever fraction is left over is the answer
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Common units of conversion
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How does the unit conversion technique work
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Remember! you must make the units match the conversion ration that you have memorized and that means using scientific notation or changing units
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Not how you are not cross multiplying
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it might be easier to convert the second fraction into a number (0.5) in this case and then multiply it
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Writting in scientific notation
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Note that if the decimal went the other way the power would be negative
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Where does the decimal go in scientific notation
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as shown. Keep in mind if you are making a big number small than the exponent will be positive and if a small number is made big than it will be negative
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Multiplying scientific notation
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just add exponts and multiply whole numbers (not sure if ill ever use this)
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Just subtract the bottom exponent from the topexponent
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Subtract the bottom exponent from the top exponent
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How do you adjust the exponents when moving the decimal
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If you move the decimal further to the right you are decreasing the size of the exponent
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general rule of thumb when moving decimals
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What if the bottom exponent is bigger than the top
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it becomes negative
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100rad/1Gray
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100rad/1gray
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100rem/1sv
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100rem/1sv
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1 millicurie (mCi) = 37 megabecquerels (MBq)
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1 millicurie (mCi) = 37 megabecquerels (MBq)
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1 roentgen (R) =
2.58x 10^-4coulomb/kilogram (C/kg) |
1 roentgen (R) =
2.58x 10^-4coulomb/kilogram (C/kg) |
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1rad = 1rem =1R
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1 rad =1rem=1R
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When converting between units
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you have the reverse the exponent sign. For example there are 1000 milirems in 1 rem
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Another way to think about it is
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take the exponent of the thing you are trying to convert to and then assign that to the unit for instance milimeters to meters you can say there are 1x10^-3 meters in 1mm
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10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)
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10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)
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10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)
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10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)
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Simple and fast reminder on how to do logs
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http://www.youtube.com/watch?v=F1BdAhjM5x8&feature=relmfu
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