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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 282 Documents
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Analisis Pengaruh Dosis Radiasi Eksternal Akumulasi Dosis yang Diterima Petugas Radiasi di Ruang Penyinaran Radioterapi RSUP dr.Hasan Sadikin Bandung Budi Muhammad AR; Eko Hidayanto; Very Richardina
Youngster Physics Journal Vol 7, No 2 (2018): Youngster Physics Journal April 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In radiation utilization, the regulation should be applied to minimize radiation dose received by the officer in order not to exceed the provision of Dose Limit Value based on BAPETEN Regulation No. 4 of 2013 that the average of equivalent dose is ≤50 mSv/year and ≤20 mSv for five-year period. The purpose of this study was to analyze the external radiation dose received by each officer at Radiotherapy Installation RSUP dr.Hasan Sadikin Bandung based on the NBD that has been determined. The equivalent dose values were obtained from the Thermoluminisence Dosemeter (TLD) of each officer over a five-year period from 2012 to 2016 that had been read by using a TLD reader. Then the radiation exposure measured by using a surveymeter with a distance of 3 meters from each teleterapi aircraft with radioactive sources to predict the distance factor between officers and radiation sources. The results showed that teleterapi operators received the highest equivalent dose in a five-year period with a dose value of 0.206 mSv/year, then in 2013 the external radiation dose received by officers and medical physicists reached the highest value when compared to another officers, with the average value of equivalent dose was 0.085 mSv/year and 0.55 μSv/hour. If observed from the distance factor, in 2013 each officer tends to come near to the source of radiation at every working hour. All radiotherapy officers at RSUP dr.Hasan Sadikin Bandung from 2012 to 2016 received a safe radiation dose and not exceed the NBD determined by BAPETEN. Keywords: Dose Limit Value, External Radiation Dose, Equivalent Dose, Distance
PENGOLAHAN MODEL KECEPATAN MENGGUNAKAN METODE RAY TRACING UNTUK MIGRASI DOMAIN KEDALAMAN (PRE STACK DEPTH MIGRATION) 2D PADA LAPANGAN “AV” Anjar Evita; Hernowo Danusaputro; Muhammad Mualimin
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

The research was done to process 2D seismic data by Pre Stack Depth Migration (PSDM) method on Field “AV”. The purpose of this study was to determine the appropriate interval velocity model for PSDM methods work. Interval velocity model obtained from the initial estimate using coherency inversion velocity model is usually not convergent. Interval velocity model should be improved through several stages in order to speed the estimated value closer to the value of actual speed. Some initial interval velocity model parameters should be improved to be more sensitive to lateral velocity variations for PSDM. The method used to improve the velocity model is horizon-based tomography with the concept of ray tracing. These methods made improvements to the speed and geometry of the reflector layer to produce a new interval velocity model. Model errors must be corrected by residual moveout analysis. The best analysis obtained from the fifth iteration to eliminated errors and increased depth value gathers. The exact value of the speed made a good quality image. The results of this research was PSDM Section or PSDM cross-section. The quality of PSDM cross-section was good enough to represented geological structures in the earth's sub surface.Keywords: PSDM, interval velocity model, horizon-based tomography, ray tracing, residual moveout analysis.
PENGUKURAN PERUBAHAN SUDUT POLARISASI PADA KOLESTEROL SEBAGAI KOREKSI PADA MINYAK SAWIT Ulfa Maftukhah; Ketut Sofjan Firdausi
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

This research aims to determine the relation between changes of polarization angle and increased levels of cholesterol and triglycerides on palm oil (expired palm oil, edible palm oil) to the change of polarization angle. Samples were placed on a polarimeter with a light source of 100 W incandescent lamp. The results showed that the increase in the cholesterol is directly proportional to the change in polarization angle. The greater increase of cholesterol levels result in the greater of the change of polarization angles that showed in the non linier graph. The value of the change of polarization angle in expired palm oil, edible palm oil are θ cholesterol = 0,26⁰; 0,25⁰ for cholesterol and θ triglycerides = 1,19⁰ ; 0,6⁰ for triglycerides, respectively. So it can be seen that the increase of each change of polarization angle of triglyceride which is the difference of θ total with θ cholesterol are affected by the increase of cholesterol levels in the cooking oils. The volatile property of the solvent and the less stabil environment temperature also could affected the result of the study.
INTERPRETASI SISTEM PANAS BUMI GUNUNG TELOMOYO BAGIAN UTARA KABUPATEN SEMARANG BERDASARKAN DATA GEOMAGNET Hiskia Anggit Maulana; Tony Yulianto; 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

Research has been carried out using the magnetic methods that have aim for interpret the subsurface structure of Telomoyo Mount geothermal field. The second aim is for analysis the model of Telomoyo Mount geothermal field previous.Magnetic data acquisition has been carried out in 83 points by using a couple of PPM (Proton Precession Magnetometer). Those are a PPM GSM19T model geometric is used looking for total magnetic anomaly and the second one is PPM G856X model that used as a base station. Then the result of acquisition data is processed by the daily correction and IGRF (International Geomagnetic Reference Field) correction. The corrected data is used to create total magnetic anomaly contour. Magnetic field that negative values is the research target and then do subsurface cross section that looking for visualization of conceptual geothermal model of Telomoyo Mount by processing of upward continuation and reduction to pole.The result of study showed a pair of positive and negative closure that indicating a fault under surface zone. In 2D modeling result is about 1400 meters depth. In 800 to 1400 meters depth can be interpret as a clay cap with a low susceptibility parameter that valued  -0.313 x 10-3 (SI-unit).Keywords: Geothermal, Telomoyo Mount, total magnetic field 
Analisis aktivitas radionuklida alam dan dosis paparan radiasi pada material bangunan Riana Anis Safitri; Evi Setiawati; Gede Sutresna Wijaya
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

Building materials cement, gipsum and sand were analized quantitatively and qualitatively for the natural radionuclides using gamma spectroscopy method with detector high purity germanium (HPGe). The highest value observed in the activity concentration of 226Ra, 232Th and 40K were found in sand that 42,12 Bq kg-1, 27,79 Bq kg-1and 316,20 Bq kg-1. The highest value of radium equivalent (Raeq) 106,21 Bq kg-1 was found in sand are bellow the internationally accepted values (370 Bq kg-1). The highest value of internal and external hazard indices were found in sand 0,401 dan 0,287 are less than unity (Hin≤1 and Hex≤1). The highest value of absorbed dose rate was found in sand 49,52 nGy h-1 are lower than the world population-weight average of 84 nGy h-1. The highest annual effective dose values was found in sand 0,243 mSv y-1 is lower than the limit of accepted value 1 mSv y-1. The study shows that measured radioactivity for bulding materials cement, gipsum and sand does not pose as significant source radiological hazard and is save for use in construction of building or dwelling.Keywords: Nature radionuclide, Radiation dose, Gamma spectrometry 
PENENTUAN NILAI TEBAL PARUH (HVL) PADA CITRA DIGITAL COMPUTED RADIOGRAPHY Cicilia Artitin; Suryono Suryono; Evi Setiawati
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

Half value layer (HVL) can be determined by using the method of digital image processing. This research is done by using stepwedge as an object. The stepwedge exposed a tube voltage of 80 kV and 10 mAs, 20 mAs, 30 mAs, 40 mAs, and 50 mAs. After getting the next image is processed in Matlab to find the value of gray level and HVL value . HVL values generated in this study was 3.08 mmAl, mmAl 3.60, 5,67mmAl, mmAl 7,27, and 8,41 mmAl. HVL value is still allowed under the Indonesian republic health minister's decision no. 1250, 2009, requirements on the voltage value of 80 kV HVL better when ≥ 2.3 mmAl. The value for examination was stated in Regulation No. Head BAPETEN 9 of 2011 so that the X-ray plane fit for use . Keywords: Half Value Layer (HVL), Stepwedge, Grey Level, Digital Image
Deposisi, karakterisasi sifat optik dan uji degradasi Db71 pada lapisan tipis Zno:Co konsentrasi tinggi Ahmad Pradana; Heri Sutanto; Eko Hidayanto
Youngster Physics Journal Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A thin layer of ZnO:Co was deposited on a glass substrate using a spray coating method with the addition of Co doping variations of 5%, 10%, 15%, 20% and 25%. The ZnO:Co thin film is further used to degrade the Direct Blue 71 dye solution under sunlight irradiation. ZnO:Co solution was synthesized by dissolving Zinc acetate dehydrate (ZnAc) into isopropanol and then added monoethanolamine (MEA) and cobalt nitrate at room temperature with concentration of ZnAc 0.3M and molar ratio of MEA and ZnAc of 1:1. Then the stirred solution used a magnetic stirrer at a temperature of 70oC for 30 minutes to obtain a clear and homogeneous gel. Gel ZnO:Co is placed on a spray hole and then sprayed on a heated glass substrate at 400oC. The optical properties of the ZnO:Co coating were characterized using UV-Vis spectroscopy. The results showed that the addition of Co doping on a thin layer of ZnO resulted in an increasingly high absorbance in the Co doping sample at a concentration of 15%. In addition, the greater concentration of Co will decrease the value of the energy band gap. The results of photodegradation test of Direct Blue 71 dye solution on ZnO:Co photocatalyst were able to degrade dye by 16% of entire samples .Keywords: Photocatalyst, Thin film ZnO:Co, Spray Coating, Direct Blue 71
KARAKTERISASI CAP ROCK DAN RESERVOIR AREA GEOTERMAL X BERDASARKAN STUDI SEISMISITAS DENGAN METODE SED Anjar Oktikawati; Udi Harmoko; Imam Baru Raharjo
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

X geothermal area is located in the western Indonesia with high seismicity. Microearthquake (MEQ) data in geothermal exploration usually used as one of tools for approximating permeable structure in geothermal reservoirand for determining boundaries of reservoir.Five seismic recording stations recorded the earthquake in the period October 2011 to December 2011. From 34671 records data stored on the period, only 68 events microearthquake (MEQ) are inverted to obtain the hypocenter with Single Event Determination method (SED).Result inversion of the method show that permeable zone at X geothermal area is located at 10000 to 22000 X axis and 5000 to 12000 Y axis. Depth distribution shows that cap rock is located about 580 meter to 1100 meter mean sea level and the reservoir is located at altitude about 600 meter to -2000 depth. Keywords: microearthquake (MEQ), hypocenter, SED, reservoir geothe.
Analisis turbulensi pada pesawat Etihad Airways EY-474 tanggal 4 Mei 2016 dengan metode Weather Research and Forecasting Nuriyana Muthia Sani; Rahmat Gernowo
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The micro weather analysis for turbulence incident of EY-474 Eithad Airways aircraft on May 4, 2016 involving injured passengers, was numerically simulated using the Weather Research and Forecasting (WRF) numerical model software. The input data is obtained from the predicted Final Analysis (FNL) that can be downloaded at the site. Elements obtained from WRF output include Richardson Number Index (Ri) and Vertical Wind Shear (VWS). Flight data to determine the time and location of the turbulence events obtained from the site address. The results obtained events around the waters of Palembang and Bangka Island. And supported by Himawari 8 satellite image data infrared (IR) canal and visible canal (VIS) and Kochi University infrared (IR) satellite to see the condition of the clouds. The results of the Kochi University satellite data show there are no convective clouds. However, on the Himawari 8 satellite shows there are clouds with peak temperatures cool enough and showing a central cloud. Simulation results show turbulence with strong intensity explaining turbulence incident on May 4, 2016 in Palembang and Bangka Island waters. Keywords: himawari, turbulence, WRF
SIFAT OPTIK Zinc Oxide (ZnO) YANG DIDEPOSISI DI ATAS SUBSTRAT KACA MENGGUNAKAN METODE CHEMICAL SOLUTION DEPOSITION (CSD) DAN APLIKASINYA UNTUK DEGRADASI ZAT WARNA METHYLENE BLUE Agustya Tri Surono; Heri Sutanto
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In this research, ZnO thin films have been successfully deposited on glass substrates by spray coating technique with a variety of solution concentration 0,3M, 0,5M, 0,75M and 0,9M. Optical properties ZnO thin films were characterized by using UV-Vis spectroscopy. Methylene blue as degradation media was used to estimate the photocatalytic activity from deposition samples ZnO. The research showed that the greater the concentration of the deposition solution in the absorption value increases, the transmittance decreases and getting smaller value of the band gap energy. Assay results photocatalytic activity of ZnO was able to degrade methylene blue to 96.6%.Keywords: Photocatalyst, Spray coating, ZnO, Band gap energy, Methylene blue.

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