Wahyu Setia Budi
Diponegoro University

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STUDI SIFAT ELEKTROOPTIS PADA KACA AKUARIUM, KACA PREPARAT, DAN AKRILIK Nila Kusuma, Anis; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The properties of electrooptics of transparency media such as aquarium glass, micro slides, and acrylic have been studied. To obtained the change of refractive index (Dn) of materials against external static electric field (E), the samples are placed in two parallel plates applied by potential different of  0 ? 104 V. The maximum external field reached by this experiment is in order 106 V/m. The change of refractive index as function of E is measured by Michelson interferometer equipment. First, our results show that the refractive index decreases as E increases for all samples. Second, Dn varies slightly square to E, which is still the dominant of linear electrooptic coefficient. The graphs both of acrylic and slides are rather smooth, which indicates that the crystal structures are more regular than aquarium glass. Key Words: electrooptics, refractive index, static electric field
PENGARUH TEKNIK TEGANGAN TINGGI TERHADAP ENTRASCE SKIN EXPOSURE( ESE ) DAN LAJU PAPARAN RADIASI HAMBUR PADA PEMERIKSAAN ABDOMEN Dhahryan, Dhahryan; Setia Budi, Wahyu; Azam, Much
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The measurement for influence of high voltage technique to Entrance Skin Exposure and is Rate of Scattered Radiation Exposure on abdomen inspection has been conducted. The ESE measurement is conducted using Electrometer and is calculated by semi empirical method, while in measurement of rate of scattered radiation exposure using survey meter at a distance of 100 cm from the object by varying data intake points and its direction of detector. The result indicates that the usage of high voltage technique yields absorbent dose of 124 mrad and radiation exposure of 339 mR. It is lower than the standard value of absorbent dose of 322.7 mrad and radiation  exposure of 130,5 mR. The result of measurement is higher than calculation. In measurement of exposure of scattered radiation rate with detector position faced to object, on right side of cathode, it yields 1.03mR/hour with standard voltage and 0.32 mR/hour with high voltage technique. While in measuring  exposure of scattered radiation rate and back-scattered obtained result on A? and C? (close to anoda and side of object) and A? and C? nearly same, with highest value of 1 mR/hour and 0.93 mR/hour at standard tube voltage and at high kV technique obtained lower value of 0.29mR/hour and 0.25mR/hour.
PERBANDINGAN NILAI DENSITAS CITRA MENGGUNAKAN GRID BERGERAK (MOVING GRID) POSISI HORISONTAL DAN VERTIKAL Supriyati, Supriyati; Setia Budi, Wahyu; Sutanto, Heri
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

In making radiographs  often differences exposure  factors used when using  moving  of horizontal and vertical. This study aims to determine the comparative value of the density of the resulting image when using a moving grid of horizontal and vertical position. So that research results can be applied in an effort to improve the quality of the radiograph. The study begins with the initial  test  without the grid to determine   density value, the second initial test using a moving grid both  horizontally  and vertically without  the  use  of material / objects.  Research   continued with three  aluminum thickness variation are  1 mm, 3 mm and 5 mm. Then using acrylic  material three thickness   variation are 1 cm,  2 cm and 3 cm. Results of image density measured using a densitometer.Results are then analyzed the data.  The  results  of research  show   value  of   the   image   using  horizontal    grid  density has    smaller  values  than    the  vertical    but   still within the   range  of  values density using   vertical   grid.  Thus   it can    be  said    that    the   image  density  values using  moving    grid   horizontal   position   is  not different with    density  of  the image using a vertical grid at the same exposure factors.Keywords: radiograph,  moving grid,  density,  comparison value
DISTRIBUSI FLUKS NEUTRON SEBAGAI FUNGSI BURN-UP BAHAN BAKAR PADA REAKTOR KARTINI Athiqoh, Fatkhiyatul; Setia Budi, Wahyu; Anam, Choirul; Tjiptono, Tri Wulan
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 effective multiplication factor (keff) and the flux distribution in the Kartini reactor which used Uranium Zirconium Hydride (UZrH) as fuel, pure water (H2O) as moderators and cooland has been analyzed using Monte Carlo simulation. The flux distribution analyzed by splitting core reactor become 5 rings (B, C, D, E and F). The effective multiplication factor (keff) and flux distribution calculated by MCNP 4C with burn-up variation 0%, 2,5%, 5%, 7,5%, 10%, 12,5%, 15%. The result shows that the critical condition obtained from burn-up rate 0% up to 5%. The highest value of flux distribution in the middle, at ring B and the value gets smaller towards to edge of reactor core.Keywords : flux distribution, keff, MCNP, Kartini reactor
EVALUASI METODE PERHITUNGAN KETEBALAN PERISAI PADA RUANG DIGITAL RADIOGRAFI Wulandhari, Wulandhari; Setia Budi, Wahyu; Dwiyanto, Agung
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

This research would discuss about the methods to determine shielding thickness for X-Ray of digital radiography room published by BIR (British Institute of Radiology), NCRP (National Council on Radiation Protection), KEMENKES No.1014/Menkes/SK/XI/2008 and Perka BAPETEN No. 4 (2013). Each method assume different considerations so evaluation is needed in terms of it?s ability to control external radiation exposure.                Shielding thickness based on NCRP and BIR need data such as space map area of the other side operation X-Ray, shift workers, total number of patient, and distance of primary and secondary radiation to the point of occupation, all of data collected based on survey before experiment. Then shielding thickness calculated  based on the dose rate inside and outside room be used as a comparation.                 The result  of primary Pb shielding thickness by NCRP 49 is 1,00  mm, NCRP 147 is 0,469 mm and BIR is amount of 0,650 mm. The secondary Pb thickness shielding by NCRP 49 is 0,500 mm, NCRP 147 is 0,170 mm and BIR is amount of 0,00980 mm. Shielding thickenss based on dose rate, for primary Pb shielding thickness is  0,898 mm and secondary Pb shielding thickness is 0,987 mm respectivelly. The result of shielding thickness based on NCRP 49 method is closer with the result by shielding thickness was based on dose rate. Keywords: NCRP 49, NCRP 147, BIR, Shielding Thickness, Dose Rate.
PERBANDINGAN KUALITAS CITRA CT SCAN PADA PROTOKOL DOSIS TINGGI DAN DOSIS RENDAH UNTUK PEMERIKSAAN KEPALA PASIEN DEWASA DAN ANAK Rozanah, Rozanah; Setia Budi, Wahyu; Arifin, Zaenal
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
ANALISIS PERBANDINGAN PARAMETER DAN PROFIL DOSIS MENGGUNAKAN PHANTOM STANDAR DAN TIDAK STANDAR Fajria, Nora; Setia Budi, Wahyu; Arifin, Zaenal
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

A study has been conducted to analyze the dose parameters are CTDI100, CTDIw, CTDIvol, DLP and dose profiles by using standard phantom (150 mm) and non-standard phantom (300 mm). This research utilized an abdomen phantom, CT Dose Profiler and software Ocean. Exposure factors in this study in accordance with the conditions of the abdomen routinely performed at the Hospital of the tube voltage 120 kV, current 350 mA, collimation 40 mm, and pitch 1.375. The detector is placed in the center of the phantom and scanning with variation of scan-length 150 mm and 200 mm in the standard phantom (150 mm) and the variation of the scan-length 150 mm, 200 mm, 300 mm in non-standard phantom (300 mm). The result obtained is the parameter dose values in the non-standard phantom (300 mm) are higher than standard phantom (150 mm). At a scan length of 150 mm, the difference in value is 4.825% CTDI100, CTDIw 4.858%, 4.823% CTDIvol, and DLP 4.820%. Meanwhile, the difference in the value of the parameter dose at the scan length of 200 mm is CTDI100 3.477%, 3.494% CTDIw, CTDIvol 3.510%, and DLP 3.512%. The resulting dose profile has similar peak-dose value but have a different width so that the dose profile in non- standard phantom (300 mm) is wider and having higher FWHM value than the standard phantom (150 mm) because non-standard phantom has longer scan length that lead to excessively scattered radiation.Keywords: CT Dose Profiler, dose profiles, scan length, standard phantom, non- standard phantom, CTDI100, CTDIw, CTDIvol, DLP, FWHM.
ANALISIS KESERAGAMAN CITRA PADA PESAWAT ULTRASONOGRAFI (USG) Sudarsih, Kesawa; Setia Budi, Wahyu; Suryono, Suryono
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

The computer base system to determine uniformity of ultrasonography image quality has been developed at various attenuation(dB) and Time Gain Compensator (TGC).The equipment used in this study was 2-dimensional ultrasonic apparatus and multi-purpose multi-tissue phantom models 040GSE. Data collection was performed by scanning the phantom using a linear transducer with a frequency of 8 MHz. The mean and standard deviation of image density of it ROI calculated used computer base system then analyzed with trendline if the image density value in the range between mean and sd  it means image uniform. The result shows that the uniformity of the image is influenced the value of attenuation and TGC. This value increase proportional with increasing attenuation. For greater value of the TGC the uniformity tends downward. At 45-60 dB  obtained distribution image uniformity sd value is 0.20 and 0.28, and at minimum up to maximum TGC  obtained distribution image uniformity sd value is 0.33 and 0.48. This value can be used for quality assurance reference of USG equipment. Keyword : USG Equipment, Uniformity, Region of Interest, Digital Image Processing
STUDI KUALITAS MINYAK GORENG DENGAN PARAMETER VISKOSITAS DAN INDEKS BIAS Sutiah, Sutiah; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The aim of this research to investigate the quality of palm oil through its viscosity and refractive index before and after used. Viscosimeter Ostwald is used to measure the viscosity and refractive method in prism is used to measure refractive index. The measurement was carried out in room temperature. The samples are fresh oil, and expired oil. Analysis of the quality of palm oil based on viscosity measurement and refractive index show that palm oil that had not been used is the highest value and the palm oil that twice used is the lowest value. Keyword: viscosity, quality of oil
EFEK MAGNETO OPTIS PADA LAPISAN TIPIS (ZNO) Adi, Muhamad; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The magneto optics phenomenon on a thin film has been observed using Michelson Interferometer. The transparent materials used in the experiment is a cover glass (thickness of 1 mm) coated by the thin film ZnO (Zincite) in 54 mm of thickness. An external magnetic field which is applied to the transparent materials is in the order of 184,95 mT  obtained by a coil inserted by a soft magnet and given by the alternating current. To obtain the change of refractive index, an Michelson Interferometer has been used using He-Ne laser with = 632,8 nm and output power of 1 mW. The change of phase or refractive index of ZnO is very clearly shown by the increasing of number of fringes as the magnetic fields increases. The order of the linear coefficient magneto optics is 10-10 m/V indicates that it is very reactive to a external applied field. Keywords: Michelson Interferometer, Non-linear Optics, Refraction Index and Linear Magneto-optic Coefficients