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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 172 Documents
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Indikasi Mineralisasi Tipe Porfiri di Daerah Sumbersari, Kompleks Pengunungan Kulon Progo, Purworejo, Indonesia Verdiansyah, Okki; Muharif, Damas; Sukadana, I Gde
EKSPLORIUM Vol. 41 No. 2 (2020): NOVEMBER 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.2.5959

Abstract

Kulon Progo Mountain is Sunda-Banda Arc magmatism product composed of an old andesite formation. Sumbersari Area is part of the Gajah volcanic, which is the oldest rock of Kulon Progo volcanics. Indication of porphyry type mineralisation has been found in the area which makes the area interested for further research. The research methodologies are geological mapping, petrography and ore microscopy, and geochemical analysis using XRF and ICP-MS. Geology of the area located in central-proximal facies of Khuluk Gajah, consist of microdiorite, quartz-microdiorite, andesite, basaltic-dioritic andesite intrusions, and limestone. Hydrotermal alteration is developing into certain groups like illite-sericite ± secondary biotite, epidote-actinolite-calcite ± illite, epidot-calcite ± illite, and illite-sericite ± quartz. Some mineralisation phases are developed like epidote-actinolite followed by magnetite-chalcopyrite mineralisation, biotite-magnetite-chalcopyrite-bornite phase and the late phase of sericite-clay-pyrite replacing the entire system. Geochemical analysis on altered rocks show Cu-Au mineralisation indication ranging from 491-1,447 ppm (0.14%) and 0.02-0.3 ppm respectively, with Cu:Au ratio is 1.01. Geochemical characteristic shows strong correlation of Cu to Au.
Reduksi Torium Pada Limbah Cair Pengolahan Monasit Menggunakan Resin Penukar Anion Hasna, Laili; Amalia, Suci; Marisi, Dany Poltak
EKSPLORIUM Vol. 41 No. 2 (2020): NOVEMBER 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.2.6006

Abstract

The effect of separating rare earths from monazite is wastewater containing the radioactive element thorium which is harmful to the environment and living things. A standard method of separating thorium from wastewater is with anion-exchange resin. This study determines the optimum type of anion-exchange resin, resin weight, and contact time to reduce thorium levels in monazite wastewater. The results showed that the optimum exchange rate that occurred in Amberlite IRA402 resin is 57.7%, at 60 minutes and 1 gram. Meanwhile, the optimum exchange rate for Tulsion A23 resin is 50.7%, at 50 minutes and 1 gram. The statistical test showed that there was no significant difference in the resin type and contact time variation, which showed a considerable value >0.05. At the same time there was a substantial difference in resin mass variation with a significant value <0.05. The Duncan test stated that lighter resin masses (0.25 and 0.5 gram) are suitable for Tulsion A23 and heavier resin masses (0.75 and 1 gram) are ideal for Amberlite IRA402.
Fitoremediasi Limbah Radioaktif Cair Menggunakan Kayu Apu (Pistia stratiotes) Untuk Menurunkan Kadar Torium Soheti, Prima; Sumarlin, La Ode; Marisi, Dany Poltak
EKSPLORIUM Vol. 41 No. 2 (2020): NOVEMBER 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.2.6092

Abstract

Thorium (Th) waste is an alpha-emitting radioactive waste that is harmful to the environment and living things so it is necessary to treat the waste effectively with phytoremediation. Phytoremediation is a plant ability to reduce pollutants presence in the environment. This research aim is examining apu wood plant ability to reduce Th contents from Th-contaminated waste. The UV-VIS spectrophotometer analysed Th level in apu wood plant and liquid waste while the Ludlum Model 1000 Scaler measured their radioactivity. The parameters for phytoremediation occurrence include the decreasing physical condition of the plants, the pH of the waste that is close to neutral, and the temperature that fluctuates with the ambient temperature. The results showed that the plant biomass of apu wood decreased after phytoremediation to 96.2% with a remediation efficiency of 97.4% from the initial concentration of Th liquid radioactive waste of 10 ppm. This is due to thorium absorption resulting in thorium accumulation in apu wood plants of 4,069.4 mg/kg. Apu wood was also able to reduce Th liquid waste radioactivity to 0.631 Bq/L from the initial radioactivity of 2.819 Bq/L. The radioactivity level is below the Klierens Level and it is safe to release the waste into the environment.
Kajian Risiko Pajanan Sinar Gama dan Radon pada Pekerja di Area Terowongan Eksplorasi Uranium Remaja, Kalimantan Barat Noor, Tajudin; Tejamaya, Mila; Saputra, Miki Arian; Purwanti, Tri
EKSPLORIUM Vol. 41 No. 2 (2020): NOVEMBER 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.2.5882

Abstract

A risk assessment of gamma radiation and radon gas exposure is carried out in the uranium exploration tunnel area to protect workers from the ionizing radiation hazards in the workplace. Measurement of gamma-ray exposure and radon gas concentrations were carried out in Remaja uranium exploration tunnel and around the workers camp in Kalan Area, West Kalimantan. Gamma exposure was measured using a gamma survey meter while radon (222Rn/220Rn) using RADUET passive detector. The concentrations of radon and thoron gas inside the tunnel generally are high, ranging from 188.84 to 495.86 Bq/m3 (375.80 Bq/m3 average) and 58.07 to 340.73 Bq/m3 (189.80 Bq/m3 average) respectively. These values are above the radon reference level (300 Bq/m3)which is recommended by the International Commission on Radiation Protection (ICRP). The annual gamma effective dose reaches 147.88mSv inside the tunnel. This value is exceeding the 20 mSv dose limit value for workers. It is necessary to control the exposure by fulfilled the principle of “as low as reasonably achievable” (ALARA) and external radiation protection to secure workers inside the tunnel from a health issue caused by gamma-ray, radon, and thoron exposures.
Profil Unsur Tanah Jarang Granitoid Klabat di Pulau Bangka dengan Analisis Aktivasi Neutron Widana, Kurnia Setiawan; Priadi, Bambang; Handayani, Yustina Tri
EKSPLORIUM Vol. 35 No. 1 (2014): MEI 2014
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2014.35.1.1343

Abstract

Neutron Activation Analysis (NAA) is a powerful geochemical analysis with advantages which are nondestructive and involves multi-elements. NAA technique applied for qualitative and quantitative analyses on Klabat granitic rocks that distributes and compose the geology of Bangka Island. There are 27 samples analyzed which aims to determine the content of rare earth elements, which will be applied in petrotectonic of Klabat granitoid. Rare Earth Elements (REE) which analyzed, namely La, Ce, Nd, Sm, E, Gd, Tb, Yb, and Lu. All of the samples irradiated in the Centre of Multipurpose Reactor "Siwabessy", BATAN - Serpong and subsequently counted with High Purity Germanium detector (HPGe) considering half-life and elements contents that will be concerned both qualitative and quantitative analysis. The comparative quantitative analysis method conducted using Standard Reference Material (SRM) 2710a and 2711a that published by the National Institute of Standards & Technology (NIST). The result are the pattern of spider diagram with the chondrite normalized and showing the enrichment of La-Sm as light REE (LREE) and Eu-Lu slight decreasing as heavy REE (HREE), as identify of plutonic rocks thar formed in the continental arc.
Studi Geologi Teknik Tapak Penyimpanan Akhir Limbah Radioaktif (LRA) Demo Plant Tipe NSD Kedalaman Menengah di Puspiptek, Serpong Syaeful, Heri; Sucipta, Sucipta; Sadisun, Imam Achmad
EKSPLORIUM Vol. 35 No. 1 (2014): MEI 2014
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2014.35.1.1367

Abstract

Final disposal of radioactive waste intended to keep radioactive substances does not released to the environment until the substance activity decreased to the safe level. Storage concept of radioactive waste (RAW) final disposal that will be developed at the area of Puspiptek, Serpong is near surface disposal (NSD). Based on depth, NSD divided on two type, near surface NSD and medium depth NSD. Concept NSD in this research is medium depth NSD, which is between 30–300 meters. During NSD construction in medium-depth required the works of sub-surface excavation or tunneling. Analysis of in-situ stresses and sub-surface deformation performed to recognize the stress magnitude and its distribution that developed in soil/rock as well as the deformation occurred when sub-surface excavation takes place. Based on the analysis, acknowledged the magnitude of tensional and compression stress and its distribution that range from -441 kPa to 4.028 kPa with values of natural deformation or without reinforcement between 4.4 to 13.5 cm. A rather high deformation value which is achieved 13.5 cm leads to necessity of engineering reinforcement during excavation. The designs of engineering reinforcement on every excavation stage refer to the result of modeling analysis of stress and deformation distribution pattern.
Studi Awal Geologi di Wilayah Kabupaten Pamekasan untuk Mendukung Pemilihan Calon Tapak Instalasi Desalinasi Nuklir Ngadenin, Ngadenin; Subiantoro, Lilik; Widana, Kurnia Setiawan
EKSPLORIUM Vol. 35 No. 1 (2014): MEI 2014
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2014.35.1.1828

Abstract

The area around the southern coast Pamekasan is one of the candidates for the alternatives location of nuclear desalination plant site. In 1949 around Sampang Madura ever tectonic earthquake measuring 5 on the Richter scale with its epicenter on land. Tectonic earthquake with epicenter on land is likely related to the presence of active faults on the island of Madura. Location prospective nuclear desalination plant site should be away or free of active faults. Aim of this study is to obtain geological information and know the characteristics of tectonics including active fault to support site studies of nuclear desalination plant on the island of Madura. The method used is the geological mapping scale, 1 : 50,000. Lithology in the area along the south coast district Pamekasan is alluvium Holocene age and conglomerate units of Pleistocene age. There were no indications of active faults in the region. Candidates site at this location is less attractive in terms of geotechnical foundation as can be ascertained bedrock will be found sufficient in that building construction will require expensive.
Studi Kualitas dan Potensi Pemanfaatan Airtanah Dangkal di Pesisir Surabaya Timur Wahyudi, Wahyudi; Setiyono, Arief; Jayanthi, Onie Wiwid
EKSPLORIUM Vol. 35 No. 1 (2014): MEI 2014
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2014.35.1.1837

Abstract

The eastern part of coastal area is one of the fast growing urban area in Surabaya. Increasing in population and industrial growth have driven increasing demands for natural resources, particularly water. The objectives of this study are to identify the quality of the coastal groundwater through insitu measurement and laboratory analysis, and to find out its potential to be utilized as a source of water for coastal aquaculture. Groundwater samples from 70 sampling stasiun have been taken from east Surabaya coastal area. Measurements of the temperature, pH, and dissolved oxygen of the samples were carried out directly insitu, and measurements of concentration of nitrate, nitrit, ammonia, sulphide, and posphate conducted in the Environmental Laboratory of ITS. The results show that coastal groundwater in west part of the study area, in only very small area, can be used as a drinking water, and in almost all area of the east Surabaya coastal area is not permitted. In the central and south part can be utilized as a source of the coastal aquaculture, however in the north part is not potential, in the central area is medium, and in the south part is categorized as a high potential.
Identifikasi Daerah Interes Calon Tapak PLTN Kalimantan Barat Berdasarkan Kriteria Umum Suntoko, Hadi
EKSPLORIUM Vol. 35 No. 1 (2014): MEI 2014
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2014.35.1.1839

Abstract

Identification of interesting areas for the nuclear power plant site in general based on natural conditions and human activities has been carried out. The guidelines of International Atomic Energy Agency (IAEA) safety guide NS-R-3,(2003) concerning Site Evaluation, that the scope of study includes a regional, near regional, site vicinit, site area and assessment in West Kalimantan is regionally, includes Singkawang City, Bengkayang, Pontianak City, Pontianak Regency, Sanggau, Sekadau, Kubu Raya, North Kayong and Ketapang. The purpose of identify is to obtain interesting areas around the coastal region ± 3km to landward based on swamp conditions, the thickness of the peat, chemical industry, gas pipeline/oil, sea ports, river demarcation line, military sites, nature reserves/cultural/wildlife refuges, and population density. The methods used are description, identification, interpretation of secondary data and confirmation of a finite field, analyzed based on general criteria. Identification results obtained interesting areas includes Dekan Putih (Meliau-Sanggau), Kubu (Kubu Raya), Sukadana (North Kayong), Tempurukan (Ketapang).
Karakteristik Geokimia Basal Alkali Formasi Manamas di Sungai Bihati, Baun, Pulau Timor Widiatama, Angga Jati; Santy, Lauti Dwita; Natalia, Happy Christin; Wahyudiono, Joko; Ikhram, Rinaldi
EKSPLORIUM Vol. 42 No. 1 (2021): MEI 2021
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.1.6205

Abstract

The igneous rock of Manamas Formation in the Bihati River, Baun is one of the igneous rock outcrops in Timor Island that has not been widely studied based on its geochemical characteristic. This study aims to determine the genesis and processes that occur in the igneous rocks of the Manamas Formation within tectonic framework of Timor Island based on petrographic and geochemical analysis. X-ray Fluorescence (XRF) and Inductively Coupled Plasma-mass Spectrometery (ICP-MS) were used to determine the major elements, trace elements, and rare earth elements. The igneous rock of the Manamas Formation is a basalt intrusion with an alkaline affinity which shown an enrichment pattern of rare earth elements identical to Ocean Island Basalt (OIB). This study proves the existence of two different mechanisms of elemental enrichment, fluid related enrichment which related to the subduction activity of the Indian Ocean plate under the Banda Arc and also melt related enrichment which originated from the broken Indian Ocean plate which enters the OIB reservoir zone. The two different magmas then mix and underplating beneath the Banda Arc.

Page 9 of 18 | Total Record : 172

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