Radiation Induced Common Mode and Individual Wire Current Response of Shielded Twisted Pair Cables

An analytical technique and experimental verification are presented for the response of shielded twisted pair cables to ionizing radiation. The common mode current of three sizes of cables is found to vary from 3.6 to 3.9×10-6 Amps/m/cal/cm2-sec. The individual wire current was found to vary from 0.23 to 2.3×10-6 Amps/m/ cal/cm2-sec, over the range of loads considered. The effects of air and multiple exposures are discussed. The model developed is applied to several differential mode configurations.