MORTAR PASIR BESI DENGAN VARIASI PENAMBAHAN TIMBAL OKSIDA (Pb3O4) sEBAGAI PENAHAN RADIASI GAMMA

• Main Authors: , YASINTA YERRY PERMANA SARI, , Prof. Ir. Iman Satyarno, M.E., Ph.D
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/118621/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=58596
• Institution: Universitas Gadjah Mada

To find out the ideal radiation shielding material from civil engineering and radiation aspect especially in medical sector, so this research made sand iron mortar with mix proportion 1:4 with addition variation of lead oxide Pb3O4 that are 0% (M1), 20% (M2), 30% (M3), and 40% (M4) of loose volume of sand iron and also Viscocrete-10 addition 0,6% of cement weight. Water cement ratio used for M1, M2, M3, and M4 are 0,4, 0,41, 0,44, and 0,48 respectively. Sand iron and lead oxide Pb3O4 as fine aggregate are tested to obtain its density and unit weight as a basic to calculate the mix design. The specimens of each variable of mortar are tested its physical and mechanical properties that are weight per m3, compression strength, tensile strength, and water absorption with number of specimens are 3 (three) of each variable of mortar. After that, the specimens are tested with Gamma radiation with energy 1170 keV, 1330 keV (Cobalt 60), 662 keV (Cesium 137), and 323 keV (Cr 51) and X Ray radiation with energy 70 kV and 90. The specimens are block shaped size 10 cm x 10 cm with thickness variation 1 cm up to 12 cm. The result shows that the density of sand iron and lead oxide Pb3O4 are 3,8259 and 8,4693 respectively and the unit weight are 1,965 gr/cm3 and 2,535gr/cm3 respectively. Weight per m3 of mortar was increased caused by the increasing of lead oxide Pb3O4 on mortar. The compressive strength significantly increased starting on M2 (37,328 MPa) from M1 (7,594 MPa) and a bit decreased on M3 and M4 that are 32,188 Mpa and 30,144 Mpa respectively that caused by increasing of water cement ratio. The value of water absorption was decreased as an effect of lead oxide Pb3O4 addition. From the result of Gamma radiation test, it shows that the higher density, the higher attenuation coefficient of the material and if the energy increase, so the attenuation coefficient of the material decrease except at the energy above 1200 keV where the attenuation coefficient increasing back as a result of pair production phenomenon. The attenuation coefficient values of M1, M2, M3, and M4 are 0,102 cm-1, 0,145 cm-1, 0,152 cm-1, and 0,184 cm-1 respectively for energy 1330 keV