“…In the case of TEPCs, this is typically A150 plastic. This material, like tissue equivalent gas, has a mass stopping power that matches ICRU tissue (ICRU Report 44, White et al, 1989) over a wide, but still limited range of charged particles and energies; therefore, in unusual radiation fields such as high-energy accelerators or space environments, as well as any substitution of the wall-material with another material, stopping power values of the counter wall compared with tissue has to be taken into account. Finally, the simulation principle is not particular to gas detectors alone and is equally applicable to solidstate microdosimeters where the detection medium has a higher density than tissue (see section 8).…”