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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
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ANALISIS PENGARUH PERUBAHAN SENTRASI DOSIS DAN JARAK BLADDER TERHADAP DISTRIBUSI DOSIS PADA PERENCANAAN BRACHYTHERAPY KANKER SERVIKS Rinarto Subroto; Evi Setiawati; Suwardi Suwardi
Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research has been done about the analysis of the change dose sentration and bladder distance’s effect toward dose distribution in brachytherapy planning of cervical cancer. The purpose of this research is to describing dose distribution which is appropriate with criteria, to evidance dose reduction because raising bladder distance from point A, and to achieve how long the bladder distance’s from point A which is can produce the dose distribution criteria appropriate.The methods of this research is measuring bladder distance from point A in lateral projections of radiographs, doing brachytherapy planning which is using early dose sentration at the point A. The sample who is have not ideal dose disribution doing brachytherapy planning with dose sentration at point bladder. The dose distribution which is producted from the change of dose sentration has analysis to know how about brachytherapy planning succes percentage. To evidance about dose reduction because raising of bladder distance’s, has done with making distance and bladder dose’s relation graph.The results of this research is: changing of dose sentration can increasing cervical brachytherapy planing successed about 46%, raising mean distance about 1,57 mm can reduce bladder mean dose about 5,65%, inverse square law still valid for brachytherapy planning case’s although can’t used to determine how much dose at the bladder, bladder distance from point A which is can deliver dose percentage lower about 80% is more than 41 mm.Keywords: Dose sentration, bladder distance, dose distribution.
STUDI RECTENNA (RECTIFIER ANTENNA) UNTUK MENGUBAH GELOMBANG ELEKTROMAGNETIK RF MENJADI SUMBER TEGANGAN DC Nurhady Mustofa; Jatmiko Endro Suseno
Youngster Physics Journal Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

RF (Radio Frequency) electromagnetic waves energy source  are still very rare utilization besides using the RF signal is very much especially in the areas of technology and telecommunications, resulting in the number of RF electromagnetic energy in the air, if the energy source of the RF electromagnetic wave can be utilized as a DC voltage source will be promising alternative energy sources and environmentally friendly. Simulations conducted to determine the ability of the rectifier circuit, then design a rectifier that can work on GSM frequencies and antennas used Quad Band 850/900/1800/1900 antenna ANT-GXH915. Tests conducted two places, namely the testing performance of rectifier and environmental testing. Results of testing performance of rectifier using the Signal Generator at a frequency range of 50 MHz - 900 MHz rated voltage of 1,56 volts and a current of 35 uA with an efficiency of 13,95%. The results of environmental testing conducted by two sources that the source of the cellular telephone and the BTS source. Results from the source mobile phone when making calls obtained voltage value of 1,54 Volt and a current of 0,25 mA at a distance of 1 cm. Results from the source BTS to a distance of 37 meters obtained voltage value of 0,405 Volt.Keywords: rectenna, antena, rectifier, energy harvesting.
IDENTIFIKASI JENIS BATUAN CANDI DUKUH, CANDI NGEMPON DAN CANDI GEDONG SONGO MENGGUNAKAN SONIC VIEWER-SX 5251 Pertiwi Pertiwi; Tony Yulianto
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Rock identification with rock mechanics properties of rock samples to determine the type of  Dukuh temple , Ngempon temple and Gedong songo temple, with the ultrasonic wave method using Sonic Viewer SX - 5251. Travel time of ultrasonic waves on the sample is used to obtain S and P wave velocity. Data has processing using Excel software. Value of the S and P wave velocity, shear modulus , rock elasticity , and Poisson 's Ratio will be correlated with rock density tables, P and S wave velocity tables and rock mechanics properties table it can be seen kind of rock  from each of  the rock  physics properties. The research result shows that rock composite Ngempon temple, Dukuh temple , and Gedong Songo are Andesite. In addition to the density values which obtained, the level of rocks weathering can be defermind as well. Dukuh B rock sample  with a density of 2.66 gm /cm3 can be classified in level I, it show that those rocks are strong and good.  On the other samples of the Ngempon temple, gedong Songo or from another Dukuh the density values which obtained are from 2.33 to 2.49 can be classified at level II or it can be said to be strong enough .Key Word :               Ultrasonic Wave, Sonic Viewer, Ngempon Temple, Dukuh Temple, Gedong Songo Temple, Weathering, and Andesite Rocks.
INTERPRETASI GEOLOGI BAWAH PERMUKAAN DAERAH POTENSI MATA AIR PANAS KALIULO KABUPATEN SEMARANG BERDASARKAN DATA GEOMAGNET MENGGUNAKAN MODEL 2-D & 3-D Diny Agustina Rahayu; Udi Harmoko; Tony Yulianto; Sugeng Widada; Yusuf Dewantoro
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The geothermal hot springs has been discovered in the Kaliulo area, Pringapus district of Semarang Regency. The research was conducted by 2-D and 3-D model geomagnetic for find the geological subsurface structure. Observation data such as magnetic field of 61 point used one set of PPM (Proton Precission Magnetometer) GSM geometrics 19 T and two units Geotron Magnetometer Model Unit G5. Data analysis of geomagnet was undertaken by diurnal correction and IGRF (International Geomagnetic Reference Field) correction to obtain the total of magnetic field anomalies. The total magnetic field anomaly data were utilized to create anomaly contour. That anomaly is used for doing reduction to plansurface process, upward continuation that produce anomalies local and regional, and reduction to pole. Modeling was done on the local magnetic anomalies to review subsurface using Mag2DC and UBC Mag3D. The results showed the + (positive) closure and – (negative) closure that can indicate anomalies object in other word to be weak zone or geological structure of fault is available, so that the slicing is made on that closure. Based on the model 2-D normal fault structure the northwestsoutheast trending and northeast-southwest, this interpreting so that normal faults which controlled source hot springs Diwak to Kaliulo.  
IDENTIFIKASI PANAS BUMI DIWAK DAN DEREKAN KECAMATAN BERGAS KABUPATEN SEMARANG DENGAN MENGGUNAKAN METODE AUDIOMAGNETOTELLURIK Elvera Yuanita Rukmana; Udi Harmoko
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Audio-Magnetotellurics (AMT) surveys has been conducted in September 2013 in the Diwak and Derekan geothermal fields. The purpose  of the audio-magnetotelluric surveys to indicate heat source, reservoir, and cap rock. The data obtained from the field was apparent resistivity, phase difference, and coherence as a function of frequency are processed using softwere package WinGLink then matched with regional geological information studies, and the results are interpreted.Characterization of geothermal systems include the caprock with a resistivity of 0-10Ωm value where the area is a zone of conductivity. Then the reservoir area is suspected to have a resistivity value with arange of 50-500 Ωm with a depth of about 500 m. In the heat source located in a geothermal system resistivity values > 500Ωm with a depth of about 1.5 km. Keywords: AMT, geothermal, resistivity
Analisis preservasi amplitudo dan resolusi seismik pada data hasil reconvolution lapangan “X” Cekungan Sumatera Tengah Agus Muhidin; Udi Harmoko; Hernowo Danusaputro; Moh. Irfan Saputra Haris
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Structure interpretation of post-stack seismic data to delineate lithology boundary sometimes face difficulties in tracking reflector continuity, this is due to limitation of vertical resolution.  Reconvolution method has been applied to fix vertical seismic resolution. In order to validate the function reconvolution to amplitude related interpretation, amplitude variation with offset (AVO) has applied to geology model.  Reconvolution method was applied by increasing dominant frequency of seismic data and capable to minimize tuning thickness zone of geology model has been made. Modeling geology based on average of P velocity, S velocity, and density from field “X” well data and estimating P velocity, S velocity and density for fluid condition of reservoir. AVO analysis has been applied to validate how far reconvolution method capable to maintain amplitude behavior, AVO analysis using Zeoppritz equation in 10 to 30 degree angle and using intercept attribute (A), gradient (B) and product (A*B). Reconvolution method has used 50 Hz, 60 Hz, 65 Hz, and 70 Hz of wavelet.  Reconvolution method capable to fix vertical seismic data resolution, it can be seen by decreasing of tuning thickness from 16 to 14 meters. Based on AVO analysis that be used for validate reconvolution method is showing intercept (A) and gradient (B) value be affected by fluids condition in reservoir and presence the random noise in the seismic data. Intercept (A) and gradient (B) for reconvolved data do not have significant changes. However, wavelet has used in reconvolution that possess the smallest error value is wavelet with dominant frequency in 60 Hz and 65 Hz.Keywords: Structure interpretation, Tuning thicknes, Recovolution, and AVO analysis. 
REKONSTRUKSI CITRA CT DENGAN METODE BACK PROJECTION (BP) DAN ALGEBRAIC RECONSTRUCTION TECHNIQUE (ART) MENGGUNAKAN MATLAB Ariyanti Nur Anisa; Evi Setiawati; Choirul Anam
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Have been made CT image reconstruction with Back Projection method (BP) and Algebraic Recontruction Technique (ART) used Matlab. Image reconstruction used parallel beam in the projection angle from 0 to 180 degree, with interval 5, 7,5 and 10 degrees. In this research, the number pixels was 30x30. The result shows us that image reconstruction used BP method  still there are lots of blurring, while the image reconstruction used  ART method can display the same object with the original image. In the smaller interval of the angle projections, then it will get better results, but it takes longer. Keywords: image reconstruction, parallel beam, back projection, algebraic reconstruction technique
PERBANDINGAN KUALITAS CITRA CT SCAN PADA PROTOKOL DOSIS TINGGI DAN DOSIS RENDAH UNTUK PEMERIKSAAN KEPALA PASIEN DEWASA DAN ANAK Rozanah Rozanah; Wahyu Setia Budi; Zaenal Arifin
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The use of scaning protocol with high dose and low dose in CT scan would affect the quality of the images obtained. Because of the importance of good radiographic images in the enforcement of proper patient diagnosis, then performed an analysis of the image quality obtained from both protocols.Image quality assessment of high-dose protocols and low doses for routine head examinations carried out through performance analysis using the AAPM CT phantom performance, comparison of the value of GM conspicuity and Contrast to Noise Ratio (CNR) of the image of the patient as well as comparison of gray scale images through image histogram comparison phantom homogeneous and patient image histogram.Results of analysis of the performance of the two protocols by assessing the accuracy of the CT number, noise, low contrast resolution and spatial resolution showed that high-dose protocol has better performance than low-dose protocol. Image with high-dose protocol has an average GM conspicuity of 0.3863 and CNR 7.0105, while the image with a low dose of 0.4144 and 6.2725 at CNR. Comparison of gray scale image of the protocol through the image histogram comparison homogeneous phantom and patient image shows that the image of a low-dose protocol has variation of intensity gray value that is wider than high-dose protocol.Keywords: Computed Tomography, scaning protocol, image quality, GM conspicuity, CNR
Distribusi radionuklida alam dalam sampel lingkungan tanah, air dan tanaman sekitar PLTU Rembang Aditya Yoga Syah Putra; Dwi P. Sasongko; Zaenal Arifin; Sukirno Sukirno
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of the natural radionuclide distribution of soil, water and plant samples around Rembang Coal Fired Power Plant (CFPP) has been done with the purpose of the study is to know the activity concentration of natural radionuclide, the pattern of distribution of environtment radioactivity around Rembang CFPP with soil, water and plant samples and compare the activity concentration of natural radionuclide around Rembang CFPP with Environmental Radioactivity Limit Values (ERLV) which is listed on the Perka Bapeten No 16 of 2013 about Safety Radiation in Storage of Technologically Enhanched Naturally Occuring Radioactivity Material. Sample analysis method using gamma spectrometry with HPGe detector and Maestro 2 software is based on SNI 1070.3-2009. The calculated concentration of natural radionuclide activity 226Ra, 228Ra, 232Th dan 40K in soil sample is (8.17×10-3 ± 2.33×10-4; 9.99×10-3 ± 1.69×10-4; 7.84×10-3 ± 2.78×10-4; 4.46×10-2 ± 6.78×10-4) Bq/g. Water sample (3.07×10-3 ± 4.05×10-4; 3.59×10-3 ± 3.22×10-4; 6.59×10-4 ± 5.59×10-5; 2.82×10-2 ± 1.93×10-3) Bq/L. Plant sample (1.69×10-3 ± 9.06×10-5; 7.56×10-4 ± 5.04×10-5; 4.13×10-4 ± 3.03×10-5; 1.17×10-2 ± 7.52×10-4) Bq/g. The distribution pattern of the concentration of natural radionuclide activity that is formed that is in the soil sample has the distribution pattern of the distance from CFPP Rembang the bigger concentration activity. Furthermore, in water and plant samples the distribution pattern tends to lead to a location close to the CFPP that has a bigger concentration of activity. Comparison the concentration of natural radionuclide activity with Environmental Radioactivity Limit Values (ERLV) it was found that the overall concentration of natural radionuclide activity in soil, water or plant samples at each sampling site still did not exceed the Environmental Boundary Limit Radioactivity (ERLV) that defined by Perka Bapeten No 16 of 2013 about Safety Radiation in Storage of Technologically Enhanched Naturally Occuring Radioactivity Material.Keywords: Natural radionuclide, environment sample, Rembang CFPP, gamma spectrometry, radioactivity, distribution.
DETEKSI THORIUM PADA KAOS LAMPU PETROMAKS MENGGUNAKAN SPEKTROMETER BETA DENGAN DETEKTOR SINTILASI DARI BAHAN ORGANIK NAFTALEN Nina GInanto Putri; Evi Setiawati
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The radioactivity of Thorium contained in gas mantles has been successfully detected. Thorium is the source of radiation that it emits the types of alpha (α) and beta (β) radiation, so it can be said to have radiation with little activity. In this study, the detection of radioactivity of Thorium using a scintillation detector with an organic material of Naphthalene scintillator which has a efficiency value of 53.42%. In addition, the composition of the materials was characterized by Energy Dispersive X-ray spectroscopy (EDX). Gas mantles mounted on petromaks lights and it turned on. The result of combustion of powders was pressurized, so that it became a solid sample. The variations of  sample were A and B, while there were 9 variations of Naphthalene scintillator thickness of 0.5 mm intervals in the range 1-5 mm. The A sample result of EDX characterization show that the composition of the constituent material C, Mg, Cu, and Th. The composition of the material making up the B sample  was  B, O, Y, Pt, Pb, and Th. Thorium activity was determined by counting the samples for 10 seconds each variation of the thickness of the scintillator. The radiation activities of Thorium were found in A and B samples respectively, 8.419 and 8.692 nCi.Keywords: Plasma jet, characterization of  plasma jet,  flow rate of Argon gas, voltage, current

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