Gray/rad/R

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

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>Date:         Fri, 14 Nov 1997 18:38:52 -0800
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>From: George R Lazarescu <GLAZARES@PRODIGY.NET>
>Subject:      Gray/rad/R
>To: Multiple recipients of list MEDPHYS <MEDPHYS@LISTS.WAYNE.EDU>
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>The definition: 1Gray = 100rads = 114R is wrong and is equivalent to saying
>
>1apple =1orange, only because there is one of each. Gray and rad are units
>for the absorbed dose and R is the unit for exposure. These two physical
>quantities are completely different and 1Gray can not be equal to 114R.
>For the same reason, 0.876 rad/R  is a correspondence not a conversion
>factor.
>100 is the conversion factor from Gray to rad (the same physical quantity)
>and the equation: 1Gray = 100rad is correct.
>The second half of the above "definition" can be expressed correctly
>without using "=" , only by saying that: an absorbed dose of 1Gray (100
>rad) in air CORRESPONDS to an exposure of 114R.
>
>
>George Lazarescu, Ph.D.
>Medical Physicist
>Long Island College Hospital
>Brooklyn, NY
>e-Mail address: glazares@prodigy.net
>