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Geopolymer concrete for radiation shielding application
Nurhasmi
Materials Science Forum
Q4Abstract
Abstract. Ashield of gamma radiation with a basic material of fly ash (FA) type C have been made by additional graphite (G) and Fe 2 O 3 (F) using Retsch MM 400 for 30 minutes at the frequency 10 Hz. GF is added to the FA matrix with mass variations of 0%, 1%, 2%, and 3%. Samples were activated with alkali solution at 70°C. Density obtained by calculation of each sample FA_GF0, FA_GF1, FA_GF2, and FA_GF3 are 2.09 g/cm -3 , 2.111 g/cm -3 , 2.113 g/cm - 3 , and 2.115 g/cm -3 , respectively. For sample FA_GF3 the density is high but the attenuation coefficient is small. This is influenced by the presence of graphite content in the sample. Graphite also plays a role in forming pores caused the radiation more transmitting through the samples. It can be concluded that the very good composition of the additional of GF is 2% with half value layer (HVL) is 3.980 cm and mean free path (MFP) is 5.743 cm.