Studi Kontribusi NORM dan TENORM pada Tanah terhadap Aras Radioaktivitas Lingkungan di Surabaya Barat

• Main Author: Mumtaz, Afif Juan
• Format: Theses and Dissertations NonPeerReviewed
• Language: English
• Published: 2023
• Subjects: Nuclear Engineering
• Online Access: https://repository.ugm.ac.id/278376/1/Skripsi%20Afif%20Juan%20Mumtaz%20final.pdf; https://repository.ugm.ac.id/278376/
• Institution: Universitas Gadjah Mada

Radiation exposure received by humans can come from NORM contained in soil and rocks, the amount of which depends on the geological conditions of each area. Metal smelting and limestone mining activities also concentrate NORM and allow for an increase in environmental radioactivity that can be harmful to humans. In this study, an analysis of environmental radioactivity was carried out in West Surabaya. A total of 12 soil samples were taken. The samples were prepared by cleaning, drying, grinding, sifting and isolating for 20 days. Samples were analyzed by gamma spectrometry method to determine the radioactivity concentration of natural radionuclides. Surfer software version 13.0 was used to map the distribution of radionuclide radioactivity concentrations. The results of the study found several types of natural radionuclides, including: 40K, 232Th with decays namely 228Ac, 212Pb, 208Tl and 226Ra with decays namely 214Pb and 214Bi. 40K radionuclide has a concentration range of 47.156 ± 4.227 Bq/kg to 350.807 ± 62.493 Bq/kg. At 232Th has a concentration with a value range of 18.856 ± 2.546 Bq/kg to 50.197 ± 14.412 Bq/kg. Radionuclide 226Ra has a concentration of 17.784 ± 2.498 Bq/kg to 57.425 ± 9.537 Bq/kg. This value is still below the environmental radioactivity standard set by BAPETEN, namely 3000 Bq/kg for 40K and 300 Bq/kg for 232Th and 226Ra. The distribution of radionuclides at high concentrations of 40K is more likely to be on the southwest and north, 232Th is more likely to be from west to north, and 226Ra is more likely to be from east to northwest. Based on the radiological parameters obtained, for Raeq, Hex, Hin, D, Deff, and ELCR respectively the mean values were 100.519 Bq/kg, 0.271, 0.366, 46.106 nGy/hour, 56.544 µSv/year, and 2.18 × 10−4. The values obtained are below the safe limits set by UNSCEAR so that West Surabaya is safe from radiological hazards.