The above translation is for the abbreviation GBq, which stands for "giga bacquerel" (one billion bacquerel). A bacquerel is defined as follows:

http://www.world-nuclear.org/info/inf51print.htm

"The SI unit of intrinsic radioactivity in a material. One Bq measures one disintegration per second and is thus the activity of a quantity of radioactive material which averages one decay per second. (In practice, GBq or TBq are the common units.)"

My guess is that "cal" stands for "caliber" مقاس

The generator (مولد) in question is probably an RTG, a radioisotope thermoelectric generator, defined as follows:

http://www.lrri.org/radiation/radgloss.htm

"A device that uses radionuclides such as plutonium-238 to produce heat for the purpose of generating electricity. Radioisotope thermoelectric generators (RTGs) are used to supply electricity in spacecraft, medical devices, and nuclear weapons."


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