Basic thermoluminescence characteristics of fabricated germanium doped cylindrical optical fibres under low dose particles irradiations

Germanium (Ge) doped optical fibres have been studied extensively as a substitute of commercially used TLD for passive dosimetry due to its affordable and robust nature. For space application, a passive dosimeter is required to be able to detect accumulated radiation from 0.5 mGy to 500 mGy. In this work, two types 6 mol% Ge doped cylindrical fibres with diameters of 483 μm (483CF) and 604 μm (604CF) were irradiated with low dose beta, low dose neutron and proton to study the fibres thermoluminescent (TL) response in terms of linearity. For all three types of radiation, compared to 483CF, 604CF shows higher TL responses due to the larger core volume of 604CF producing more TL response. The fibres show high linearity at for all types of radiations with correlation of determination (r2) of higher than 0.97. From the minimum detectable dose ( ) calculated, beta, neutron and proton irradiated fibres accordingly can detect at least until 0.029 mGy, 0.55 mGy and 33.81 mGy. From the and linearity of the fibres at lower doses, it can be concluded that the fibres can be used for low dose particles radiation detection for space dosimetry.