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All Journal Jurnal Ilmiah Aplikasi Isotop Radiasi
June Mellawati
Pusat Teknologi Keselamatan dan Metrologi Radiasi - BATAN
Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Immunology & microbiology Materials Science & Nanotechnology

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Experimental Study of Concrete Composites of Fly Ash and Ferronickel Slag for Gamma-Ray Shielding Patrick Marcelino Wongso; Syamsir Dewang; Eko Budi Jumpeno; Okky Agassy Firmansyah; June Mellawati
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 16, No 1 (2020): JUNI 2020
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2020.16.1.5800

Abstract

This study aim is to determine the effect of partial replacement of cement by high percentages of fly ash and ferronickel slag as gamma radiation shielding properties of concrete. The percentages of replacement were 30% for fly ash and 10%, 20%, and 30% for ferronickel slag by weight of fine aggregate. Several physical parameters (linear attenuation coefficients, mass attenuation coefficients, half value layer, tenth value layer, mean free path, effective atomic number, and effective electron density) of concretes were measured using 600cc Thin Window Ionization Chamber. A broad beam transmission geometry method with 137Cs source was used for the radiation intensity measurements. The elemental compositions of the concretes were analyzed by using an energy dispersive X-ray Fluorescence Spectrometer (EDXRF). In this experiment, the concrete composite sample with composition of 0% fly ash and 30% ferronickel slag shows the most effective result in absorbing low energy gamma rays, therefore it has the potential as a candidate for gamma radiation shielding.
Radon (222Rn) Radioactivity Level at the BATAN Workplace using RAD7 Arsita sita; Dahlang Tahir; June Mellawati; R Pradana
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 16, No 2 (2020): Desember 2020
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2020.16.2.6000

Abstract

Measurement of Radon (222Rn) radioactivity level at BATAN office Jakarta has been done. Radon is a radioactive emitting alpha particle, very dangerous to the health because if it is inhaled, will be accumulated in the lungs and cause lung cancer. The purpose of the research was to determine the activity concentration of 222Rn in the workplace and to estimate the dose received by workers. The sampling method is purposive sampling, in several office rooms of the BATAN office (staff room, laboratory, and warehouse), measurement 222Rn using RAD7 continuously for 24 hours. Based on the activity concentration of 222Rn in the rooms, an estimate of the effective dose received by the workers while working indoors can be calculated. The results showed that exposure of 222Rn gas radiation in the workplace was relatively varied, radiation exposure in warehouses was 18.90-32.90 (25.90) Bq.m-3 higher than in laboratory 8.20-34.00 (22.43) Bq.m-3 and staff room 5.40-29.60 (16.68) Bq.m-3. The estimated effective dose received by workers in the warehouse is 0.1865 mSv.year-1, laboratory 0.1615 mSv.year-1, and in the staff rooms 0.1267 mSv.year-1, and this value still meets the quality standards of radiation exposure required by the Ministry of Health No. 7 of 2019 and is categorized as safe.
Co-Authors Arsita sita Dahlang Tahir Eko Budi Jumpeno Okky Agassy Firmansyah Patrick Marcelino Wongso R Pradana Syamsir Dewang