Effectiveness of Kevlar and water-soaked hygienic wipes in a combined radiation shield for manned long termed space missions

Exposure to Galactic cosmic rays (GCR) and solar particle events (SPE) in long term space missions, astronauts will experience both immediate and delayed impacts. To confront space radiation active and passive shielding approaches are available and deploying a suitable coupling of these two shields can be a good solution. This paper presents a combined radiation shield comprising an active toroidal shield with an additional 10 cm layer of a passive shield made of Kevlar or Water-soaked hygienic wipes (WSHW). The active shield can deflect protons with energy around 575 MeV, and it can deflect higher Z particles (Alpha, Fe) up to 190 MeV/n. The shielding effectiveness of Kevlar and Water-soaked hygienic wipes was investigated with Monte Carlo simulations. The shielding properties were studied using proton, alpha, and Fe ions with energies of 1 GeV/n. WSHW has shown greater radiation shielding efficiency than Kevlar. For Kevlar, the rate of total absorbed dose reduction for proton, alpha, and Fe ion is 3.47%, 43.36%, and 44.53% respectively and for WSHW, the rate is 4.2%, 45.13%, and 59.87% respectively. Results are also compared with Polyethylene (PE). The shortcomings of this form of shield are also briefly covered as well.