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What units are all considered equivalent

Roentgen, Rad and Rem can all be considered equivalent (as long as there is no quality factor or modifying factor)


What are the common units of roetgens

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 onethousandth of a roentgen. An exposure of 50 roentgens would be written "50 R".


What are rads

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.


What are rem

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.


Sample conversion

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


Common units of conversion



How does the unit conversion technique work

Remember! you must make the units match the conversion ration that you have memorized and that means using scientific notation or changing units


Not how you are not cross multiplying

it might be easier to convert the second fraction into a number (0.5) in this case and then multiply it


Writting in scientific notation

Note that if the decimal went the other way the power would be negative


Where does the decimal go in scientific notation

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


Multiplying scientific notation

just add exponts and multiply whole numbers (not sure if ill ever use this)


Just subtract the bottom exponent from the topexponent

Subtract the bottom exponent from the top exponent


How do you adjust the exponents when moving the decimal

If you move the decimal further to the right you are decreasing the size of the exponent


general rule of thumb when moving decimals



What if the bottom exponent is bigger than the top

it becomes negative


100rad/1Gray

100rad/1gray


100rem/1sv

100rem/1sv


1 millicurie (mCi) = 37 megabecquerels (MBq)

1 millicurie (mCi) = 37 megabecquerels (MBq)


1 roentgen (R) =
2.58x 10^4coulomb/kilogram (C/kg) 
1 roentgen (R) =
2.58x 10^4coulomb/kilogram (C/kg) 

1rad = 1rem =1R

1 rad =1rem=1R


When converting between units

you have the reverse the exponent sign. For example there are 1000 milirems in 1 rem


Another way to think about it is

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


10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)

10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)


10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)

10mGy=1rad (important to know bc all the bullshit dose limits are in rads or rems and the machines give you mGy)


Simple and fast reminder on how to do logs

http://www.youtube.com/watch?v=F1BdAhjM5x8&feature=relmfu
