[R] How can I write the square root symbol in an axes label?

[21rosit]

And how can I write the units of my axis but outside the square root symbol
I have

plot(1:10, ylab=bquote(Log(sqrt("Total area (mm)")))) 

but I need it as in the attached picture
<http://r.789695.n4.nabble.com/file/n4645602/square_root_mm1.jpg> 



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