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Ganendra: Majalah IPTEK Nuklir
ISSN : 14106957     EISSN : 25035029     DOI : https://doi.org/10.17146/gnd
Core Subject : Science, Education,
Jurnal Iptek Nuklir Ganendra merupakan jurnal ilmiah hasil litbang dalam bidang iptek nuklir, diterbitkan oleh Pusat Teknologi Akselerator dan Proses Bahan (PTAPB) - BATAN Yogyakarta. Frekuensi terbit dua kali setahun setiap bulan Januari dan Juli.
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Articles 6 Documents
Search results for , issue "Volume 26 Nomor 1, 2023" : 6 Documents clear
STUDY OF POISSON NOISE REDUCTION ON GAMMA CAMERA IMAGE USING SPATIAL DOMAIN FILTER Puspitasari, Ayu Jati; Karthika, Risky Nurseila; Nugrahani, Puspa Ayu; Febrianti, Widya; Hidayati, Nur Rahmah
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6822

Abstract

A gamma camera image is produced by a gamma camera that detects the gamma radiation emitted by the radioactive substance or radiopharmaceutical injected into the body. The gamma camera image sometimes has noise that can interfere with the diagnosis. This image is commonly affected by a Poisson-type random noise. This research proposes using a spatial domain filter to study Poisson noise reduction in gamma camera images. The image sample used is the image of a mouse injected with Lu-177-DOTA Trastuzumab with 100 µCi activity detected using a dual-head gamma camera with NaI(Tl) detectors. The grayscale image is treated with Poisson noise, then improved using a spatial domain filter. The spatial domain filters used include Mean, Median, Wiener, and Spatial Lowpass Filters. The mean filter is the best one that can reduce Poisson noise among the four applied filters. The best filter size for noise reduction is 3 with MSE 5.07, PSNR 41.08 dB, and SSIM 0.99.
PENENTUAN TINGKAT KLIERENS LIMBAH RADIOAKTIF HASIL SEMENTASI KONSENTRAT EVAPORASI DAN TINJAUAN KESELAMATAN PEMBUANGANNYA Suhartono, Suhartono; Kundari, Noor Anis; Romli, Moch.; Sumarbagiono, Sumarbagiono
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6839

Abstract

Telah dilakukan penelitian untuk mengukur tingkat klierens 14 unit shell beton 950 L milik Instalasi Pengelolaan Limbah Radioaktif, Direktorat Pengelolaan Fasilitas Ketenaganukliran, Badan Riset dan Inovasi Nasional (IPLR-DPFK BRIN). Shell-shell beton tersebut merupakan paket hasil olahan konsentrat evaporasi limbah radioaktif cair yang dikondisioning dengan teknik sementasi. Jika telah memenuhi tingkat klierens, maka shell-shell beton tersebut dapat dibebaskan dari pengawasan Badan Pengawas Tenaga Nuklir (BAPETEN) melalui mekanisme klierens sehingga pada akhirnya dapat menambah ruang kosong di gedung penyimpanan sementara limbah radioaktif. Penelitian dilakukan dengan mengukur laju dosis radiasi, tingkat kontaminasi permukaan, dan konsentrasi aktivitas radionuklida pemancar α, β, dan ϒ untuk menentukan tingkat klierens. Dari penelitian yang telah dilakukan dapat diketahui bahwa laju dosis tertinggi 0,15 µSv/jam, tingkat kontaminasi permukaan tertinggi sebesar 0,0148 Bq/cm2 untuk radionuklida pemancar α dan 0,0935 Bq/cm2 untuk radionuklida pemancar β. Nilai tingkat klierens radioaktivitas unit shell beton 950 L yang diuji berkisar antara 0,47020 – 0,66730. Mengacu pada Peraturan Kepala BAPETEN Nomor 16/2012 tentang Tingkat Klierens, kandungan radionuklida dalam shell-shell beton 950 L yang diuji telah mencapai tingkat klierens. Pembuangan klierens terhadap 14 unit shell beton tersebut sangat mungkin untuk dilakukan karena shell-shell beton tersebut tidak mengandung bahan berbahaya dan beracun (B3). Perkiraan dosis radiasi yang akan diterima oleh kelompok kritis, tidak akan melebihi 10 µSv per tahun.     
CESIUM CHEMISORPTION ONTO STAINLESS STEEL UNDER SIMULATED LIGHT WATER REACTOR SEVERE ACCIDENT Ngarayana, I Wayan
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6809

Abstract

During light water reactor severe accident, source terms may interact with structural materials, generating new compounds and affecting their volatility which make the existing codes could not accurately estimate the radioactive release. Cesium is one of the source terms that can interact with structural materials and contributes greatly to the late release phenomenon. Several studies have been conducted to predict the physicochemical interactions between cesium and structural materials. However, the types of chemisorbed cesium compounds onto structural materials are still under discussion. For this reason, this study was carried out using advanced techniques, involving TEM, SEM, EDS and FIB to estimate the chemisorbed cesium compounds onto stainless steel structural material under simulated light water severe accident. This study indicates that cesium is strongly adsorbed on the oxide layer of stainless steel in the form of cesium silica, cesium aluminum silica, and/or cesium ferro silica. CsFeSiO4 and CsAlSiO4 could dominate these compounds.
AN IMPROVEMENT OF ARJUNA 1.0 CONVEYOR SYSTEM FOR 3D IRRADIATION Saefurrochman, Saefurrochman; Purwanto, Agus Tri; Adabiah, Suhadah Rabi'atul; Sukaryono, Sukaryono; Setiaji, Galih; Arthanto, Dwi Handoko; Anggraeni, Karina; Rachmawati, Isti Dian; Dwiatmaja, Agus; Wijono, Wijono; Nuraini, Elin; Andriyanti, Wiwien; Darsono, Darsono; Adjie, Andreas Bimo Putro
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6826

Abstract

An improved design of the conveyor system of Arjuna 1.0 electron accelerator for 3D object irradiation has been done. The penetration of low energy electrons is less than 1 cm in the surface, causing a challenge for the irradiation process for sterilization of 3D objects. We design a conveyor that can be rotated 360o to irradiate objects evenly. The dimension of this conveyor is 1750 x 600 x 800 mm and the maximum diameter of the object is 7 cm. Based on the Frame Bending Stress analysis to calculate the strength of the conveyor frame, it is shown that the maximum displacement is only 0.029 mm, which is very small so it will cause no disturbance to power transfer from the motor to the conveyor. The normal stress (Smax) is 3.926 MPa and the bending stress for Smax (Mx) and Smax (My), are 2.391 MPa and 3.925 MPa respectively. We also calculate the stress analysis of the 3 mm-thickness of the motor mount and found that the Von-Misses Stress, first, and third Principal Stress are 4.425 MPa, 5.01 MPa, and 1.95 MPa respectively. These results confirm that the design and the material used for the conveyor are safe because the stress is very low than the material’s yield strength which is 207 MPa. The power needed for this conveyor is 0.01724 kW, with a maximum speed is 880 rpm. The new model of 3D conveyor has been constructed and can be implemented to ARJUNA 1.0 to irradiate objects on all its surfaces
THE EFFECT OF THE DC-SPUTTERING PROCESS ON CHANGES IN THE HARDNESS VALUE AND ELEMENTS COMPOSITION OF BIOCOMPATIBLE STAINLESS STEEL 316L MATERIAL Sahabudin, Nuha Nazilah; Mukaromah, Uli Aprilia; Andriyanti, Wiwien; Sutanto, Heri
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6834

Abstract

Titanium Dioxide (TiO2) thin films have intriguing optical, photocatalytic, and electrical properties and have been investigated for various applications, including solar cells, biomaterials, corrosion-resistant materials, and gas sensor. In this study, TiO2 thin films were deposited on the surface of 316L Stainless Steel  to improve its mechanical properties as an implant material. The deposition method used was DC sputtering with variations in deposition times of 30, 60, 90, 120, and 150 minutes. Vickers hardness test and SEM-EDX characterization were carried out to determine the hardness value, elemental composition, and thickness of the TiO2 thin film formed. Based on these tests, it was discovered that the optimal hardness value of316L stainless Steel  material was attained at a deposition period of 90 minutes with a hardness value of 170.10 VHN, and the average thickness of the layer formed was ± 119.02 μm.
ANALISIS KESELAMATAN UNTUK MENCEGAH KECELAKAAN PADA PROSES EVAPORASI DI INSTALASI ELEMEN BAKAR EKSPERIMENTAL DENGAN METODE HAZOPS Oktavianto, Putra; Kundari, Noor Anis; Saputra, Ade; Abdurrosyid, Imam; Saputra, Andri
GANENDRA Majalah IPTEK Nuklir Volume 26 Nomor 1, 2023
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/gnd.2023.6844

Abstract

Instalasi elemen bakar eksperimental (IEBE) DPFK – BRIN telah menerapkan standar keselamatan sebagai acuan keselamatannya yang dalam penerapannya menggunakan Hazard Identification Risk Assesment Determining Control (HIRADC). Metode HIRADC mempunyai beberapa kekurangan sehingga dalam penerapannya masih belum maksimal. Sebagai pelengkap dari metode HIRADC, maka dalam penelitian ini akan dilakukan analisis risiko menggunakan metode lain yaitu Hazard and Operability Study (HAZOPS). Pada proses evaporasi larutan uranil nitrat yang akan diidentifikasi potensi bahayanya adalah tangki evaporator E-601. Metode HAZOPS dilakukan berdasarkan diagram proses dan instrumentasi (P&ID) yang ada untuk menentukan potensi bahaya yang mungkin terjadi selama proses evaporasi dilakukan. Metode HAZOPS dilakukan dengan menentukan titik kajian (node) dan parameter, menganalisis penyimpangan atau potensi bahaya dari setiap node, melakukan analisis kemungkinan penyebab penyimpangan dan konsekuensinya, menentukan skala likelihood serta menentukan tingkat risiko dan membuat rekomendasi. Dari penilaian yang telah dilakukan, didapatkan 6 node dan kemudian menghasilkan 11 penyimpangan yang disebabkan oleh 13 kerusakan atau kegagalan peralatan. Penilaian risiko terhadap 13 kerusakan menghasilkan 1 potensi risiko bahaya rendah dan 12 potensi risiko bahaya sedang. Kategori risiko bahaya rendah dapat diatasi dengan penanganan rutin seperti melakukan pemeliharaan preventif dan kalibrasi alat secara berkala. Untuk kategori risiko bahaya sedang, selain memerlukan rekomendasi seperti bahaya rendah, juga diperlukan rekomendasi lain dalam mengatasi penyimpangan yang mungkin terjadi sesuai dengan jenis penyimpangannya. Dari hasil analisis keselamatan yang telah dilakukan, dapat disimpulkan juga bahwa HAZOPS dapat melengkapi HIRADC untuk memastikan keselamatan terjaga saat dilakukan proses.

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