Radiation Expert
From Starsonata Wiki
An interesting class to say the least, it is not recommended for any but those who know exactly what they're getting themselves into... Radiation Experts receive +10% Damage to radiation damage and +2% to most stats on slaves. This skill costs 10 skill points per level up to level 20. Its prerequisites are Remote Control and Slave Mastery.
Radiation Experts tend to specialize in capturing ships and/or bases and using slaves.