Berkeley Nucleonics Corp.

The SAM 940 utilizes a transform that provides spectral enhancement on a second by second basis. This patented algorithm is called Quadratic Compression Conversion (QCC) and allows real time subtraction of background which dramatically improves sensitivity. Therefore, the SAM does not wait for the end of a long acquisition to subtract background but rather subtracts ambient background, Compton Effect and bremsstrahlung continuously which greatly aids in the search process as well as identification. It is well known
that statistical analysis of this type is never perfect but results show an improvement in real time sensitivity of at least a factor of 10 to 20 depending upon the size of detector. This gives the user the ability to move at a reasonable pace while searching and still be assured that radioactive sources will be found and identified.

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See Application Note

david Application Notes Isotope Identifier, Model 940, Nuclear Material