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INDONESIA
Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Published by Badan Riset dan Inovasi Nasional
ISSN : 08541418     EISSN : 2503426X     DOI : https://doi.org/10.55981/eksplorium
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology
EKSPLORIUM is published to deliver the results of studies, research and development in the field of nuclear geology. The manuscripts are the result of study, research and development of nuclear geology with scope: geology, exploration, mining, nuclear minerals processing, safety and environment, and development of nuclear technology for the welfare.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 6 Documents
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Search results for , issue "Vol. 33 No. 1 (2012): MEI 2012" : 6 Documents clear
Pemetaan Geologi dan Identifikasi Sesar Aktif di Lokasi Calon Tapak PLTN Ketapang dan Sekitarnya, Madura Ngadenin, Ngadenin; Subiantoro, Lilik; Widana, Kurnia Setiawan; Sutriyono, Agus; Widito, P.
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.2835

Abstract

The result of economical study about demand of water supply and electric in Madura Island concludes that in 2016 Madura Island will need nuclear desalination plant to process sea water becomes fresh water. In order to support the installation of nuclear desalination plant, it is required site free from active fault, because active fault is mainly rejection factor criteria on site selection process. Aim of the research is to get geological information and identify of active fault in the site candidate of nuclear desalination plant at Ketapang area and its surrounding by interpretation of aerial photograph and land sat imagery, geological and structure geological mapping as well as trenching. The lithology of Ketapang (Md.01) and Sokobana (Md.02) site candidate consists of reef and chalky limestone forming undulating hills morphology. Structurally, research area forms a monocline with East-West trending axis, plunging 10o to East, the direction of strike is West-East, dip 10o - 30o to North. Geological structure analysis show that research area is free from active fault.
The Last 41.000 Years Fluctuation in Atmosperic CO2 Concentration Inferred from The Changes in Oxygen and Carbon Stable Isotopes Ratios of The Marine Sediment Wahyudi, Wahyudi; Minagawa, Masao
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.644

Abstract

The past atmospheric CO2 concentrations were reconstructed based on the results of measurements of stable oxygen and carbon isotopic ratios of fossil foraminifer and total organic carbon contained in marine sediment taken from the Okinawa Trough, East China Sea. In this study, we utilized two models of Popp et al and Rau et al. for the reconstruction. The results show that the whole trends of the changes in CO2 concentrations are very similar, even when it is compared to the atmospheric CO2 concentration of air trapped in ice core from southern pole. Changes in atmospheric CO2 concentrations are interpreted as a consequence of fluctuation in ocean surface water utilization of CO2 by marine organism and those are closely related to glacial-interglacial (cold-warm) fluctuations between maximum and minimum values through most Quaternary.
Studi Deposit Monasit dan Zirkon Dalam Batuan Kuarter di Daerah Cerucuk Belitung Soetopo, Bambang; Subiantoro, Lilik; Sularto, Priyo; Haryanto, Dwi
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.675

Abstract

Geologically the study area lies in the distribution of granite in a single lane of Malaysian tin, Bangka-Billiton, Karimata which is containing monazite mineral monazite.Monazite is one of the radioactive minerals containing uranium (U), thorium (Th), rare earth element (REE) in phosphate bonds. Heavy minerals sample that containing monazite 2.719% has radioactivity value until 3000 c/s. Petrographic analysis of granitic rocks contain minerals monazite 1-2% with radioactivity 200-400 c/s. Based on these considerations, it is necessary to for further research in the development and assessment of prospects for mineral monazite. The Objectives to be achieved isobjective to be achieved is to localize the prospect area distribution of monazite and zircon in the area of ​​100 km2. The results of field studies showed that the presence of monazite contained in the sand, clay as alluvial deposits derived granitic rocks. Indications are reflected in the results of radioactivity measurements of soil / alluvial ranged between 50-375 c/s, measurement of radioactivity of heavy minerals (MB) ranged between 50-150 c/s at some point discovered the location of high radioactivity values ​​ ranged between 250-1000 c/s with background value of 25-150 c/s and dan contains Th (100 – 6.545 ppm) serta contains U (15 – 639,4 ppm). The results show that in the study area indicates that the potential for monazite and zircon area ​​31,680,000 m2.
Digesti Monasit Bangka dengan Asam Sulfat Prassanti, Riesna
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.676

Abstract

Technology of Bangka monazite processing with alkaline method has been mastered by PPGN BATAN with the product in the form of RE (Rare Earth) which is contain U < 2 ppm and Th 12 – 16 ppm. Hence, as comparator, the research of Bangka monazite processing with acid method using sulfuric acid has been done. The aim of this research is to obtain the optimal condition of Bangka monazite’s digestion using sulfuric acid so that all elements contained in the monazite that are U, Th, RE, PO4 dissolved as much as possible. The research parameter’s are monazite particle’s size, sulfuric acid consumption (weight ratio of monazite ore : sulfuric acid), digestion temperature, digestion time and consumption of wash water. The results showed that the optimal conditions of digestion are -250+325 mesh of monazite particle’s size, 1 : 2.5 of weight ratio of monazite ore : sulfuric acid, 190°C of digestion temperature, 3 hours of digestion time and 8 times of weight monazite’s feed of wash water with the recovery of digested U = 99.90 %, Th = 99.44 %, RE = 98.64 % dan PO4 = 99.88 %.
Pemisahan Thorium dari Uranium pada Monasit dengan Metode Pengendapan Trinopiawan, Kurnia; Sumiarti, Sumiarti
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.677

Abstract

Previous researches have obtained the monazite processing stages and resulting RE(OH)3 as a product with ± 62% of recovery, and the by products obtained in the form of a compound of thorium (Th) and Uranium (U). For further utilization, studies of U and Th separation is needed. This research is aimed to determine the optimal conditions for the separation of Th from U in monazite using the precipitation method with H2SO4 as a reagent. Stages of the process in this research consisted of grinding, decomposition, partial dissolution, total dissolution, and precipitation of Th with H2SO4. Feed solution used for precipitation is obtained from total dissolution stage with 2 different reagents are H2SO4 and HCl. Parameters of the research include the precipitating reagent (H2SO4) consumption and precipitation time. Optimal recovery results in the precipitation of sulfate feed solution are Th = 96.99% and U = 18.26% with 20 ml of H2SO4 consumption and 30 minutes of precipitation time. Optimal recovery results in the precipitation of chloride feed solution are 98.05% andU 25.03% with 20 ml of H2SO4 consumption and 30 minutes of precipitation time.
Korelasi Unsur Antara U dengan Co, Ni, Ag, Mo pada Batuan Granit dan Kuarsit di Jumbang I, Kalimantan Barat Sularto, Priyo
EKSPLORIUM Vol. 33 No. 1 (2012): MEI 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.1.2843

Abstract

Jumbang I sector is a part of the basin Kalan, West Kalimantan. As the other areas in Kalan, Jumbang I also have geochemical anomalies of uranium element in Vein of quartzite rocks at several locations, with high grade and radioactivities value between 500 c/s - 15000 c/s. Besides of the uranium element there are other elements included Co, Ni, Ag and Mo. The analysis result of 49 rock samples using Fluorimeter Jarell Ash obtained grades of U: 13 ppm - 31000 ppm and by Atomic Absorption Spectrometer obtained grades of Co : 1.5 ppm - 83.5 ppm, Ni : 15.2 ppm - 507.6 ppm, Ag: 1.2 ppm - 10.8 and Mo: 31.7 ppm - 10 738 ppm. To determine of element relationship in these rocks is using correlation method. The aim of this study is to determine of the relationship between U and Co, Ni, Ag, Mo elements. The methods of this study are statistical regression and correlation. The results of this study are obtained the correlation coefficient (R) between U – Co = 0.23, U - Ni = 12.15, U - Ag = 0.50, U - Mo = 0.86. Correlation coefficient (R) 0.86 can be interpreted as a high correlation, it means that the U element has strong associate with Mo element and weak associate with Co, Ni, Ag elements.

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