RadGen X for Mac

From Black Cat Systems:

RadGen lets you use your GM-10 or GM-45 (serial or USB versions) to generate random numbers. Unlike the pseudo-random numbers generated by computers, these numbers, generated by measuring radioactive decay, are actual random numbers, ideal for cryptography, and other math and science applications.
You can select the range and format of numbers to be generated, and control how they are generated, including how long between measurements, how many random bits to generate per measurement, and the size of the final random number.
Decimal, hex, and binary files can be generated, with a variety of delimiters between random numbers.