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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Radio-Frequency and ELF Electromagnetic Energies: A Handbook for Health (readable here) is a useful source for this discussion: <a href="http://books.google.com/books?id=lOMWHnZ4h_cC&pg=PA51&lpg=PA51&dq=absorption+of+microwaves+in+human+head+by+frequency&source=bl&ots=eIIqaYtuIt&sig=ZuH3xtZqiExb14lbx_Dzx9HgE98&hl=en&ei=_YdCTbrCDoK6sAOs9LyPCg&sa=X&oi=book_result&ct=result&resnum=5&ved=0CD8Q6AEwBA#v=onepage&q=absorption%20of%20microwaves%20in%20human%20head%20by%20frequency&f=false">http://books.google.com/books?id=lOMWHnZ4h_cC&pg=PA51&lpg=PA51&dq=absorption+of+microwaves+in+human+head+by+frequency&source=bl&ots=eIIqaYtuIt&sig=ZuH3xtZqiExb14lbx_Dzx9HgE98&hl=en&ei=_YdCTbrCDoK6sAOs9LyPCg&sa=X&oi=book_result&ct=result&resnum=5&ved=0CD8Q6AEwBA#v=onepage&q=absorption%20of%20microwaves%20in%20human%20head%20by%20frequency&f=false</a>. Page 30 is a summary of penetration depth vs. frequency and absorbed energy (measured as SAR, or <span class=dek>Specific Absorption Rate)</span>. Frequency-sweeping between 10 MHz (deep penetration) and 100 GHz (limited to ~ mm range) could achieve adjustable, homogenous gross heat distribution (measured as SAR, or <span class=dek>Specific Absorption Rate) radially, but isometric near-field antenna design to achieve homogenous heat distribution is left as an exercise to the reader :). </span><o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><span style='color:black'><img border=0 width=554 height=397 id="Picture_x0020_1" src="cid:image003.jpg@01CBBE8B.2C225450"></span><span style='color:black'><o:p></o:p></span></p></div></body></html>