...is ONLY possible with any degree of certainty if the cross section of
the interrogating beam is less than that of the particles being
interrogated. 40 micron beams or worse ("defocussed to aid in sorting" -
ugh!), needless to say, are less than optimal for this purpose (speaking
tactfully).
IMHO
Nick (thankful for his 5 micron beam)
Nicholas Terry, Ph.D.
Experimental Radiation Oncology - Box 66
U.T. M. D. Anderson Cancer Center
1515 Holcombe Blvd.
Houston
Tx 77030, USA Phone: 713-792-3424 Fax: 713-794-5369
WWW: http://drad52.mdacc.tmc.edu/
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