This is typically more important for higher energies. As energy increases, the crystal charge collection is an increasingly more important factor and the electric field within a large crystal is never 100% uniform.. Photopeaks displayed on an MCA are ideally Gaussian, but that is not always attainable. A ration of the tenth maximum to the half maximum is going to vary from the ideal with increasing detector size. Peak asymmetry will be displayed as an increasing number of counts skewing the lower energy side of the photopeak. Germanium coaxial detectors are often specified to have tenth maximum to half maximum ratios ranging from 1.9 to 2.0. Sometimes the full width fiftieth maximum to full width half maximum is of interest and generally is specified as less than 2.8/1. once again, peak shape is almost always specified at 1332 KeV.
To compare suppliers, be sure to review the datasheets from Princeton Gamma Tech here: http://www.pgt.com/Nuclear/NucLit.html
All Princeton Gamma Tech germanium detectors are available with appropriate signal processing electronics and software. PGT can provide with the complete spectroscopy package in any application that uses germanium detectors. More information is available under the headings of particular detector types on this web-site. You can call PGT directly at 609-924-7310 or contact your PGT representative in your area for further information.
Thank you for the consideration.