E.3.2 Determination of radiation-induced conductivity coefficients by direct measurement
The conductivity measurements are carried out on a sample that is subject to irradiation by gamma rays. Figure E-13 shows a suitable experimental arrangement for planar samples.
Because of the need to eliminate conductivity from ionized molecules in the air, the test are carried out in vacuum for planar samples.
The dose rate covers the range 1 to 100 rads s-1.
Where a coaxial cable is being used for cable samples, the sealed nature of the cable core means that measurements can be carried out in air.
It is important to ensure that the atomic
number of the electrodes is similar to that of the material under test,
otherwise
Figure E-13: Arrangement for carrying out conductivity tests on planar samples under irradiation