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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 7 Documents
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Search results for , issue "Vol. 39 No. 1 (2018): MEI 2018" : 7 Documents clear
Thorium and Total REE Correlation in Stream Sediment Samples from Lingga Regency Irzon, Ronaldo
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.3558

Abstract

Rare Earth Elements (REE) are found in variety of minerals, which are mobilized by weathering from adjacent watersheds into streambeds and affect the chemical content. A study of stream sediments is useful to trace the source of metals, as they are representative of the composition of the drainage basin. This study describes trace and rare earth elements geochemistry composition of selected nine stream sediment samples from two major Islands in Lingga Regency, namely Singkep and Lingga. Moreover, the associations of rare earth elements abundance to other elements in selected samples are used on tracing the most possible mineral as REE source. Nine selected stream sediments were identified megascopically and measured for the trace and rare earth elements composition by inductively coupled plasma – mass spectrometry (ICP-MS). The selected samples from Lingga yielded very strong average Zr, Mn, Ba, and Rb compositions of 246 ppm, 172 ppm, 126 ppm, and 84 ppm, respectively. On the other hand, Zr, Mn, Cr, and Rb are the top four abundant trace elements from Singkep with consecutive median value of 486 ppm, 305 ppm, 145 ppm, and 85 ppm. Feltilizer for agricultural area at Lingga most posibly contain As and Rb upon these elements abundances and association. Tin mine activity was found to influence the streambeds composition with low Rb-Cs composition but high Zr-REE abundance. Very strong Th to ∑REE association suggests that thorium-bearing mineral, especially monazite-La, is the main REE source of the selected samples. All of the studied samples exhibit Eu negative anomaly to imply the absence of either detrital apatite or chemical weathering of apatite. Moreover, REE of Lingga stream sediments is averagely more fractionated than Singkep.
Studi Keterdapatan Torium Pada Endapan Laterit Bauksit di Pulau Singkep Dalam Rangka Pengembangan Eksplorasi Torium di Wilayah Granit Jalur Timah Ngadenin; Widana, Kurnia Setiawan; Karunianto, Adhika Junara
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4258

Abstract

The thorium exploration in the last five years in the granite tin belt region is targeted at thorium availability in primary and secondary tin deposits. Singkep island is the part of granite tin belt which potential for thorium occurences either primer or secondary deposits. The purpose of this study was to determine the characteristics of thorium availability in bauxite laterite deposits concerning thorium content and its relation to the availability of radioactive minerals and cerium (Ce), lanthanum (La), Yttrium (Y), and zircon (Zr) contents on the bauxite laterite deposit. The data obtained from this study will be used as an evaluation material for the development of thorium exploration in bauxite laterite deposits in Indonesia. The methods used are geological mapping, thorium concentration measurements, and sampling of pan concentrate for mineral grain analysis and analysis of Ce, La, Y, and Zr contens. The lithology of the study area was granite that had weathered and turned into bauxite laterite deposit with thorium content ranging from 25.9 to 177.8 ppm eTh. The concentrate of the repeating result is zircon-ilmenite concentrate with radioactive mineral content composed of zircon, monazite, and anatase. La concentration on zircon-ilmenite concentrate is 0–412 ppm, Ce is 0–80 ppm, Y is 27–82 ppm and zircon is 9,420–100,000 ppm. Avaibility of thorium at the bauxite laterite deposit on Singkep Island is closely related to the zircon, monazite, and anatase minerals. Characteristics of thorium availability in the bauxite laterite deposit are similar to the thorium characteristics of the primary and secondary tin deposits.
Laju Sedimentasi di Dataran Banjir Sungai Ciujung Hulu Berdasarkan Profil Pb-210 Excess Aliyanta, Barokah; Suhartini, Nita
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4165

Abstract

The rate of deposition of sediment on the floodplain area is one of the constituent component of the sediment budget in watersheds. Therefore, the sedimentation rate estimation has been made in two locations of the floodplains based on the age sediment obtained using Pb-210 excess technique. Sediment cores were taken in the Ciujung Hulu River floodplain every 10 cm depth intervals up to a depth of 120 cm. Sediment was obtained then dried, disaggregated, sifted, weighing 150–300 gr, placed into the special containers and tightly closed. After a month in a sealed condition, samples were measured using gamma spectrometer Multichannel analyzer (MCA) to find out the activity of Pb-210 total and Pb-210 supported. Based on the data of Pb-210 total and Pb-210 supported, there are three different ways to get Pb-210 excess profiles. Obtained Pb-210 excess data is used to calculate the age of the sediments on the basis of the method of constant rate of supply (CRS). Through the age of sediment layers, can be recognized the existence of transitional zone of sediment deposition rate at both locations. The rate of sedimentation ranged from 1.028 cm/year from the years 1968–1987, and rose to about 2.83 cm/year from the years 1987–2016 (28.95 years) at location 1. While in location 2, the rate of sedimentation ranged 0.676 cm/year from the years 1950–1993, and rose to about 3.231 cm/year from the years 1993–2016 (2 years).
Penurunan Kadar Torium dan Radioaktivitas dalam Limbah Cair Proses Pengolahan Monasit PLUTHO Menggunakan Koagulan FeSO4 Marisi, Dany Poltak; Suprihatin; Ismayana, Andes
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4276

Abstract

The separation of radioactive and rare earth mineral carried out in PLUTHO produces waste that still contains thorium and uranium. The resulting waste requires further processing to be environmentally friendly. The purpose of study is to reduce thorium content and radioactivity in liquid waste of PLUTHO monazite treatment process using ferro sulphate coagulant. PLUTHO Pilot Plant is one of facility that built to dissociate uranium, thorium and light rare earth from mineral of monazite. Variations of treatments applied in the research are coagulant dosage and pH. Thorium content is measured by Spectrophotometer UV-Vis method, whereas radioactivity is measured by radiation counting meter Ludlum Model 1000 Scaler. The result shows that the optimum condition of coagulation is in pH 8,0 with concentration of ferro sulphate 225 mg/L which may reduce thorium content up to 45,20 % and reduce radioactivity to 100 % out of its initial thorium content and radioactivity as much as 0,73 mg/L and 1,35 Bq/g, respectively.
Studi Karakteristik Air-Tanah di Kawasan Nuklir Pasar Jumat (KNPJ) dengan Metode Hidrokimia dan Isotop Alam Sanusi, Neneng Laksminingpuri; Nurfadhlini; Satrio
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4100

Abstract

Groundwater research has been conducted in Nuclear Area of Pasar Jumat (KNPJ) using hydrochemical data and natural isotopes methods. The research was conducted by taking a number of water samples in some areas of KNPJ and also its surrounding areas. The water samples were then analyzed its hydrochemical concentration (anion-cation) and natural isotope concentration d2H and d18O using lasser counter device. Water chemical analysis was conducted by using ion chromatography and titration methods. The purpose of this research is to know the characteristics of groundwater to the possibility of its interaction with the surrounding surface water. Based on the results of hydrochemical analysis (anion-cation) and natural isotopes (d2H, d18O) indicates that groundwater still reflects the character as fresh groundwater or freshwater. The deep aquifer groundwater is also indicated to be unrelated to groundwater of shallow aquifers located above it. While most shallow groundwater still show the character of fresh groundwater, and some others namely SB-8, SB-9, and SB-10, the groundwater undergo ion exchanges and interact with surface water. Surface water for SB-8 is estimated come from the seepage of the liquid plant fertilizer, whereas for SB-9 and SB-10 surface water is estimated come from septic tank seepage.
Relationship Between Leadership and Commitment with Quality Performance on U-Th-REE Processing Pilot Plant Construction in BATAN Madyaningarum, Nunik; Berawi, Mohammed Ali; Miraj, Perdana
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4161

Abstract

Management area of leadership and commitment in the quality management system is a mean to achieve successful functions, even more on construction industry. The objective of this research is to analyze the correlation between leadership and commitment focus management area and quality performance as indicated by rework. Research location is uranium (U), thorium (Th), and rare earth elements (REE) processing pilot plant construction area in Center for Nuclear Minerals Technology-BATAN. Primary data were collected from the 36 of 37 submitted questionnaires, and representing 97 % response rate. The research used descriptive analysis, which depends on the poll and the use of Statistical Package for the Social Sciences (SPSS) main program for data analysis. The relationship between leadership and commitment and quality performance was analyzed using spearman rank correlation coefficient. Findings of research provide guideline and alert to project managers or management of organization where leadership, commitment, infrastructure, and environmental work have moderate to strong correlation to rework level. The results further revealed that there is no relationship between responsibility and authority for the management system and organizational policy and construction quality performance. The research provides evidence, in fact to achieve the quality performance of a pilot plant construction must be concerned with leadership attribute, maintaining commitment and provide support resources on the whole project cycle.
Pelindian Natrium Zirkonat Menggunakan Asam Klorida Secara Catu Sajima Sajima
EKSPLORIUM Vol. 39 No. 1 (2018): MEI 2018
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2018.39.1.4369

Abstract

Research on zircone processing technology has been continued to follow industrial market needed. Treatment of sodium zirconate with leaching process using hydrochloric acid as solvent has been conducted. The aim of the study is to evaluate the effect of grain size, temperature, and speed of stirring on the extracted zircon. The research starting with introduced the solvent (chloride acid 4 N) into the reactor, then heated while stirring. The feed with a certain grain size was introduced into the reactor. The temperature and stirring conditions were kept steady. Once the operating conditions are reached, the process is stopped and then filtered. The results with XRF analysis showed that the optimum process conditions were achieved on 90 μm grain size, the temperature of 80oC, and stirring speed of 200 rpm. The amount of zircon that taken out were 84.50% on this conditions.

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