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Exhibit
24.1
B
POWER
OF ATTORNEY
KNOW ALL
MEN BY THESE PRESENTS:
I, the
undersigned, do hereby make, constitute and appoint Timothy E. Guertin, Elisha
W. Finney and John W. Kuo, and each of them, my true and lawful
attorneys-in-fact and agents, each with power of substitution, in any or all of
my offices and capacities with Varian Medical Systems, Inc. as shown below, to
execute for me and on my behalf a registration statement on Form S-8 (the
“Registration Statement”) and any and all amendments and supplements thereto,
including post-effective amendments, relating to the Varian Medical Systems,
Inc. 2010 Employee Stock Purchase Plan and to file the Registration Statement,
with all exhibits thereto, and any other documents in connection therewith, with
the Securities and Exchange Commission pursuant to the Securities Act of 1933,
as amended, and the rules and regulations promulgated thereunder, and do hereby
grant unto said attorneys-in-fact and agents full power and authority to do and
perform each and every act and thing requisite and necessary to be done, as
fully to all intents and purposes as the undersigned might or could do in
person, and ratify and confirm all that said attorneys-in-fact and agents, or
their substitutes, may lawfully do or cause to be done by virtue
hereof.
IN
WITNESS WHEREOF, I have executed these presents this 28th of
July, 2010.
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/s/ Susan L. Bostrom
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Susan
L. Bostrom
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Title: Director
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