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All Journal JURNAL TEKNOLOGI LINGKUNGAN Jurnal Fisika Unand JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI
Wiyono, Muji
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Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Analisis Unsur dalam Fly Ash dari Industri PLTU Batubara dengan Metode Analisis Aktivasi Neutron Wiyono, Muji; Wahyudi, Wahyudi
Jurnal Teknologi Lingkungan Vol. 19 No. 2 (2018)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.571 KB) | DOI: 10.29122/jtl.v19i2.2778

Abstract

ABSTRACTDetermination of element contents in fly ash from the coal power plant industry at Java Island has been performed by the method of Neutron Activation Analysis (NAA). Fly ash was sampled at Electrostatic Precipitator (EP) outlet by using isokinetic probe. Collected fly ash was mixed for 2 minutes and dried using oven at temperature of 105ºC for 2 hours. Fly ash and NIST Standard Reference Material (SRM) 1633b Coal Fly ash were put into polyethylene vials of 0.273 mL with various weights of 11.01-11.24 mg, 16.94-17.34 mg and 29.97-30,27 mg respectively according to the time of irradiation. The samples were put in polyethylene capsules and then irradiated at Rabbit System of Siwabessy Multipurpose Reactor of BATAN at the Power of 15 MW (flux of neutron was 1013 n.cm-2.s-1) for 1 minute (short irradiation), 15 minutes (middle), and 3 hours (long). The content of elements in these samples was then measured by using gamma spectrometer with HPGe detector of Canberra and was analyzed with Genie 2000 and Maestro shoftwares. The result showed that fly ash from coal power plant contained mayor elements : Mg, Al, Ca, Ti, Mn, Fe, Sr and Na with the concentrations of 5,572 - 20,636 mg/kg; 36,353 -140,972 mg/kg; 27,729 - 144,296 mg/kg; 3,680 - 7,325 mg/kg; 624 - 9,515 mg/kg; 62,454 - 114,325 mg/kg,  628.0 - 1.775 mg/kg and 995.0 - 12,640 mg/kg;  and minor elements detected were Se, Cs, Zn, V, Cr, Hg, Th, Sc, As, Sr, U, Co, Nd, Hf, Rb, Sb and La at the concentrations of 2.94-76.5 mg/kg. Keywords: element content, fly ash, Neutron Activation AnalysisABSTRAKTelah dilakukan penentuan kandungan unsur pada cuplikan fly ash (abu terbang) pada industri PLTU batubara di Pulau Jawa dengan metode analisis aktivasi neutron (AAN). Abu terbang setelah melewati Electrostatic Precipitator (EP) dicuplik menggunakan probe isokinetik. Cuplikan yang terkumpul dikocok selama dua menit dan dikeringkan dalam oven pada suhu 105ºC selama 2 jam. Cuplikan abu terbang dan Standard Reference Material (SRM) NIST 1633b Coal Fly ash masing-masing dimasukkan dalam vial polietelin ukuran 0,273 ml dengan berat 11,01-11,24 mg, 16,94-17,34 mg dan 29,97-30,27 mg masing-maing untuk waktu iradiasi yang berbeda. Vial abu terbang dan vial SRM kemudian dimasukkan dalam kapsul polietilen dan kemudian diiradiasi pada Rabbit System Reaktor Serbaguna Siwabessy BATAN pada Daya 15 MW (fluks neutron 1013 n.cm-2.s-1) selama 1 menit (iradiasi pendek), 15 menit (iradiasi menengah), dan 3 jam (iradiasi panjang). Sampel hasil iradiasi pendek selanjutnya dicacah menggunakan Spektrometer Gamma dengan detektor HPGe buatan Canberra dan sampel iradiasi menegah dan panjang menggunakan HPGe buatan Ortec Model Gem-60 dan selanjutnya dianalisis menggunakan perangkat lunak Genie 2000 dan MAESTRO. Hasil analisis menunjukkan bahwa cuplikan abu terbang dari PLTU batubara mengandung unsur mayor Mg, Al, Ca, Ti, Mn, Fe, dan Na dengan konsentrasi masing-masing adalah 5.572 – 20.636 mg/kg; 36.353 – 140.972 mg/kg; 27.729-144.296 mg/kg; 3.680-7.325; 624-9.515 mg/kg, 62.454-114.325 mg/kg, 628,0–1.775 mg/kg dan 995,0- 12.640 mg/kg, sedangkan unsur-unsur minor yang terdeteksi yaitu : Se, Cs, Zn, V, Cr, Hg, Th, Sc, As, Sr, U, Co, Nd, Hf, Rb, Sb dan La dengan konsentrasi 2,94-76,5 mg/kg.Kata kunci: kandungan unsur, abu terbang, analisis aktivasi neutron.
Potential Radiological Hazard of Coal-Fired Power Plant Oktamuliani, Sri; Caredek, Puspa Tirta; Wiyono, Muji; Wahyudi, Wahyudi; Kusdiana, Kusdiana
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 14 No 1 (2025): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v14i1.25879

Abstract

Coal-fired power plants not only generate electricity but also produce coal ash containing naturally occurring radionuclides, which may pose radiological hazards to workers and nearby residents. This study aimed to assess the radiological risks associated with natural radionuclides present in coal ash and surrounding soil near PT Sugar Labinta, Lampung. To achieve this, samples of fly ash, bottom ash, and soil were systematically collected, and the specific activities of radionuclides radium-226, thorium-232, and potassium-40 were measured using gamma-ray spectrometry with High-Purity Germanium (HPGe) detectors. These measurements served as the basis for evaluating potential radiation hazards. The results showed that the gamma index values for fly ash (zero point seven seven seven), bottom ash (zero point three seven zero), and soil (zero point five one four) were all below the safety threshold (gamma index less than or equal to one), indicating low levels of gamma radiation and minimal radiological risk. Similarly, the external hazard index values ranged from zero point one two six to zero point six zero five, remaining under the recommended limit (external hazard index less than or equal to one). However, several samples, particularly fly ash (up to ninety-nine point zero two five nanogray per hour) and soil (up to sixty-five point five one one nanogray per hour), had absorbed dose rates exceeding the global average set by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). While most soil samples had annual effective dose equivalents below the standard limit of zero point zero seven millisievert per year, fly ash exceeded this value, signaling the need for continued monitoring, especially in residential areas near the power plant chimney. These findings suggest that coal ash and soil around PT Sugar Labinta generally present a low radiological risk. However, ongoing monitoring is essential to detect and mitigate potential long-term exposures. The study contributes valuable data for environmental radiation assessments and supports the implementation of effective radiological protection strategies in coal-fired power plant areas.
Penentuan Konsentrasi Radionuklida (Ra-226, Th-232, K-40, dan Cs-137) pada Bahan Pangan Menggunakan Spektrometer Gamma di Pasar Raya Kota Padang Muthmainnah, Muthmainnah; Milvita, Dian; Wiyono, Muji
Jurnal Fisika Unand Vol 9 No 3 (2020)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.9.3.394-400.2020

Abstract

Telah dilakukan penentuan konsentrasi radionuklida (Ra-226, Th-232, K-40, dan Cs-137) pada beberapa bahan pangan seperti cabe, beras, ikan laut, ikan tawar, singkong, dan daun singkong menggunakan spektrometer gamma di Pasar Raya Kota Padang. Penelitian ini bertujuan untuk menentukan data awal konsentrasi radionuklida pada bahan pangan di Pasar Raya Kota Padang. Hasil konsentrasi Ra-226 dan Th-232 dianalisis berdasarkan IAEA TE 1788 dan hasil konsentrasi Cs-137 dianalisis berdasarkan PERMENKES RI No 1031 tahun 2011. Pengukuran konsentrasi radionuklida menggunakan spektrometer gamma. Penelitian diawali dengan preparasi sampel, kalibrasi spektrometer gamma, dan pengukuran konsentrasi radionukida. Hasil penelitian menunjukkan bahwa radionuklida yang terdeteksi pada bahan pangan yaitu Ra-226 dan K-40, sedangkan Th-232 dan Cs-137 tidak terdeteksi. Ra-226 terdeteksi pada semua bahan pangan dengan konsentrasi tertinggi pada ikan tawar yaitu 2,73 ± 0,57 Bq/kg dan konsentrasi terendah pada beras yaitu 1,12 ± 0,28 Bq/kg. Konsentrasi Ra-226 yang terdeteksi pada bahan pangan melebihi batas yang ditetapkan IAEA TE 1788. K-40 terdeteksi pada semua bahan pangan dengan konsentrasi tertinggi pada cabe yaitu 958,06 ± 69,84 Bq/kg dan konsentrasi terendah pada beras yaitu 28,44 ± 2,45 Bq/kg.  The determination of radionuclides concentration (Ra-226, Th-232, K-40, and Cs-137) of some foodstuffs such as chilies, rice, sea fish, freshwater fish, cassava, and cassava leaves using gamma spectrometers in Pasar Raya Padang City has been carried out. This study purposed to determine the initial data of radionuclides concentration in foodstuffs at Pasar Raya, Padang City. The result of Ra-226 and Th-232 concentration compared with IAEA TE 1788 and the result of Cs-137 concentration compared with PERMENKES RI No 1031 of 2011. The radionuclides concentration measured using a gamma spectrometer. This study was started by preparing the sample, calibrating the Gamma Spectrometer, and measuring the concentration of the radionuclides. The results showed that the radionuclides detected in foodstuffs were Ra-226 and K-40, while Th-232 and Cs-137 were not detected. The Ra-226 detected in all of the foodstuffs. The highest concentration was 2.73 ± 0.57 Bq/kg in freshwater fish, and the lowest concentration was 1.12 ± 0.28 Bq/kg in chili. The concentration of Ra-226 detected on foodstuffs exceeds the specified limit of IAEA TE 1788. The K-40 detected in all of the foodstuffs with the highest concentration was 958.06 ± 69.84 Bq /kg in chili, and the lowest concentration was 28.44 ± 2.45 Bq/kg in rice.
Analisis Kandungan Radionuklida Alam Pada Fly Ash, Bottom Ash, dan Tanah dari PLTU di Industri Gula dengan Menggunakan Spektrometer Gamma Caredek, Puspa Tirta; Wiyono, Muji; Wahyudi, Wahyudi; Kusdiana, Kusdiana; Oktamuliani, Sri
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.423-429.2023

Abstract

Penelitian ini bertujuan untuk menentukan aktivitas spesifik 226Ra, 232Th dan 40K yang terdapat pada sampel fly ash, bottom ash, dan tanah di sekitar PLTU pada industri gula. Masing – masing tiga sampel fly ash dan bottom ash diambil dari silo, dan Sembilan sampel tanah diambil pada radius (0-4) km dari PLTU. Pencacahan sampel dilakukan menggunakan spektrometer gamma dengan detektor HPGe. Sampel dicacah selama 17 jam, dan diolah menggunakan software Maestro. Hasil penelitian menunjukkan bahwa aktivitas spesifik 226Ra dan 40K pada fly ash dan bottom ash berada di bawah nilai rata-rata dunia, kecuali 232Th pada fly ash dengan nilai rata-rata 88,45 ± 2,48 Bq/kg di atas nilai yang dilaporkan UNSCEAR. Pengukuran aktivitas spesifik 226Ra, 232Th dan 40K pada tanah di sekitar industri gula menunjukkan konsentrasi tertinggi pada tanah yang berada semakin dekat dengan cerobong PLTU. Kesimpulan dari penelitian ini adalah aktifitas spesifik 226Ra, 232Th dan 40K pada sampel fly ash, bottom ash, dan tanah di sekitar industri gula tidak menunjukkan peningkatan yang signifikan.
Co-Authors Caredek, Puspa Tirta Dian Milvita Kusdiana Kusdiana, Kusdiana Muthmainnah Muthmainnah Sri Oktamuliani Wahyudi Wahyudi