Re: Gy and Sv = J/kg -Reply

[JMUCKERHEIDE@delphi.com]

Group,

These units (and others used as "examples" of "similar" differences, are not
"similar" at all.  Eg, "Bq" and "Hz" do not redefine "sec" in order to be
"equivalent". 

For Gy and Sv, "1 J/kg == 20 J/kg" (an "identity" ) is the important
consideration, not just a semantic use of terms. Most of the "comparisons"
provided are about semantics, not scientific definitions and identities of the 
value and meaning of units. "Barns" and other such terms are interesting
constructs but don't require a fundamental reliance on an identify that can
not be defined and found in physical reality. The "barn" is a well-constructed 
term subject to physical demonstration, nor does it violate the ability to do
"dimensional analysis". 

More rigor is needed in the science. One of the foundation reasons why the Vic 
Bond, et al, analyses applying imparted energy is distinct and important, is
that they then do a rigorous, scientific, _dimensional analysis_, coming from
the "hit size effectiveness function", that satisfies the necessary scientific 
analytical rigor that the existing "radiation science" does not in its use of
loose terms without their ability to represent physical terms. 

Regards, Jim Muckerheide
jmuckerheide@delphi.com
==============================
  
> Gy and Sv both have the same SI unit, but they are different entities.
> There is some similarity.
> Cheers,
> Bill
> 
> On Wed, 9 Oct 1996, Michelle Wakelam wrote:
> 
> > IMHO, Bequeral and Hertz are both frequencies over time and thus have the 
> > same SI unit, but they are frequencies of different events.
> > 
> > Regards 
> > Michelle Wakelam