(BEING CONTINUED FROM 12/17/18)
Main source of the gamma-radiation that has aneffect to the spacecraft devices is coming from theinteractions of the charged particles with the spacecraft materials. Therefore a separated study wasmade to map the possible effects of this type ofradiation. It was seen that the effect of the secondarygamma-rays is minimal in comparison to the othersources of radiation. Figures 14 and 15 show theenergy loss of incoming gamma-rays, and themeasured dose on the scoring layer, respectively.
Figure 13: Dose on the scoring layer from electronbeams of various energies
VI.II.IV Dependence on the angle of incidence
Effects of the angular variations of the incomingradiation were also studied. Since the materials arehomogeneous, the expectation would be that theincreased angle would increase the energy loss felt bythe incoming particles since they have increaseddistance to interact with the matter. Simultaneouslythis should increase the dose measured with thescoring layer, since the number of secondary particlesshould also increase. By using nanoparticles, theangular variation will have larger effects than withuniform bulk materials.Figures 16, 17 and 18 show the effects of varyingthe angle of incoming radiation from 0 to 45 degrees
Figure 14: Energy loss of gamma-rays traversing thesample materials.
Figure 15: Measured dose on the scoring layer fromgamma-rays traversing through the samplematerials.
Figure 16: Energy loss of protons traversing through50 µm of Tungsten (left) and measured dose onscoring layer (right). The energy loss is in MeVand the dose in µGy
Figure 17: Energy loss of protons traversing through50 µm of Steel (left) and measured dose onscoring layer (right). The energy loss is in MeVand the dose in µGy
Figure 18: Energy loss of protons traversing throughPrepreg layer (left) and measured dose onscoring layer (right). The energy loss is in MeVand the dose in µGy.
(TO BE CONTINUED)