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At 9:28 AM 7/28/95, Dave Corbitt wrote:
> Reply to: RE>Rank_Hamamatsu_R878
>4. The HA designation refers to an integral magnetic shield coating on the
>PMT. Hamamatsu no longer uses this lettering and currently calls that option
Thanks to Dave for "illumination" (yuk,yuk) on this score. Can I just add
that it is a good idea to use the magnetic shielded variety, as the
photomultiplier is quite sensitive to external magnetic fields, and under
certain conditions, this can significantly reduce S/N ratio. The internal
shield reduces or eliminates the need for external exotic mu-metal cans
around the PMT.
Regards to all.