SpekCalc 1.0 for Mac is available as a free download on our application library. The SpekCalc installer is commonly called spekcalc_osx_release_1.1_light.zip. This free software for Mac OS X is an intellectual property of Gavin Poludniowski and Phil Evans. The most popular version of the program is 1.0. The program is also known as "SpekCalcOSX". The software lies within Productivity Tools, more precisely Calculators.
From the developer:
SpekCalc is an application for calculating the X-Ray emission spectra from tungsten adnodes such as those used in the diagnostic radiology and kV radiotherapy X-ray tubes. This is a light version, which only operates in the energy region between 80 and 100 kV, and for aluminium filtration.
You may want to check out more software for Mac, such as CFAbsoluteTimeConverter, PinholeCalc or McConvert, which might be similar to SpekCalc.