Articles

Pengaruh Kenaikan Suhu Cairan Developer Terhadap Densitas Radiograf Septiadi, Jujun; Anam, Choirul; Azam, Much
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Abstract

This aim of the research is to obtain an optimal developer temperature. The increase of dilution temperature of developer to radiograph density has been measured. The Research is conducted with measuring radiograph density with a certain exposure factor and materials and varies temperature among 170 C – 320 C.  The result indicates that the higher of temperature is the greater of its density value. The optimal temperature obtained at spanning temperature among 200 C – 230 C.   Key words: The dilution temperature of developer, density of radiograph, optimal temperature
UJI KECEPATAN REKONSTRUKSI CITRA PADA CT-SCAN METODE BACK-PROJECTION (BP) DAN METODE FILTERED BACK-PROJECTION (FBP) DENGAN PEMFILTERAN PADA DOMAIN SPASIAL Ngurah Sutapa, Gusti; Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Conventional X-ray have many limitations in describing the object being imaged because of overlap on multiple objects on a single line of projection. To overcome this limitation, the object was expossed in several directions, and then the projections from several directions was reconstructed to get cross-section image. The reconstruction method was widely used filtered back projection method as the development of a simple back projection. In this study will be evaluated the speed of the reconstruction for the back projection method and filtered back projection in the spatial domain. It was conducted for the projection angle from 0 to 180 degree, with interval  25, 20, 15, 10 and 5 degrees. In this research the number pixels was 50x50. It was found that the smaller of the interval of the angle projections, then it will get better results, but it takes longer. From back projection and filtered back projection methods, was obtained if the interval of the angle projections a half times smaller, it will take nearly twice as long of time. It was found that the time difference between back-projection and filtered back projection methods is less than 0.1 seconds. Keywords: Image reconstruction, back-projection, filtered back-projection, convolution
Kajian Spektrum Sinar-X 6 MV Menggunakan Simulasi Monte Carlo Anam, Choirul
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

X-ray spectra produced by Elekta Linac for 6 MV beam  have been evaluated using Monte Carlo simulation. In this simulation, Linac head was modeled using BEAMnrc code. X-ray sepctra, fluence vs position, and energy fluence vs position were determined using BEAMDP code. In this simulation, the SSD (source skin distance) was 90 cm and the field size of radiation was 10 x 10 cm2. Energy electrons arriving at the target (incident electron) was varied 5.7 MeV, 6.0 MeV, 6.3 MeV and 6.6 MeV. As for the radial intensity, FWHM values ​​varied 1.0 mm, namely 0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm. X-ray spectra were determined at the surface of the phantom. Iit was found that the curve 6 MV X-ray spectra has a shape not symmetry with an average energy of about 2 MeV. In the spectra there is no energy X-ray radiation value exceeds the kinetic energy of incident electrons. X-ray spectra is not affected by the width of electron beam striking on the target. if the electron energy increases, it will generate increased fluence and energy fluence, but no effect on the penumbra region (the edge of field size). If the electron beam width increases, it will result in the radiation field edge becomes less sharp or penumbra widening. Keywords — Monte Carlo Simulation, X-ray spectra, Linear Accelerator
Simulasi Pencitraan Ultrasonografi (USG) Menggunakan PdeTool Matlab Anam, Choirul
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Diagnostic imaging with ultrasound is based on the mechanical properties of an object. To evaluate how the ultrasound wave propagates in an object and imaging of the object, can be done with simulation techniques. Simulation of ultrasound wave propagation was performed using Matlab pdetool. The simulation was conducted to determine the image quality due to the influence from variation of the object, variations in the number of objects, various types of objects and variations in frequency of the signal. From the simulation showed that the ellipse and box objects can be distinguished. If the number of object is increased, will cause the image more complex. This happens because the waves are about an object, it would interfere with ultrasound waves that will be used to image the next object. If two objects have different c is high enough, then the imagery on the field boundary of two mediums was very clear. Conversely, if the difference is very small c, then the boundary of two mediums were not visible. If the frequency rises, causing axial resolution increase, but cause increased attenuation.   Keywords: USG, Simulation, pdetool Matlab
ANALISIS GUGUS FUNGSI PADA SAMPEL UJI, BENSIN DAN SPIRITUS MENGGUNAKAN METODE SPEKTROSKOPI FTIR Anam, Choirul; Sirojudin, Sirojudin; Firdausi, K. Sofjan
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
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An analysis of functional groups using FTIR (Fourier Transform Infra Red) spectroscopy in test samples, such as petroleum and spiritus compound has been done.The spectral of the functional groups is observed by comparing of the absorption band which is formed on infra red spectrum with the infra red lines standard and comparing with other known compound. It is expected that functional group identification can be done effectively.Infra red spectrums of petroleum show the group of methyl (CH3), alkenes and aromatic compound. That results analysis is supported by appearance of bending symmetric vibration of C-H and the presence of stretching vibration of C=C from aromatic ring. The spiritus spectrums show the group of hydroxyl from alcohol compound. That analysis is supported by appearance of wide band on 3500–3000 cm-1 and appearance of band on 1000–1100 cm-1.  While test sample spectrum show the group of hidroksil (O-H) from primary alcohol, group of metil (CH3), triple bond (C≡C–H), group of nitril (R–C≡N), double bond (C=C) and C-N.   Keyword: FTIR spectroscopy, vibration, infra red spectrum, absorption, functional group
ANALISIS FENOMENA ELECTROHYDRODYNAMIC PADA PERMUKAAN MINYAK SILIKON (CAIRAN DIELEKTRIK) MENGGUNAKAN SISTEM PEMBANGKIT PLASMA LUCUTAN PIJAR KORONA NEGATIF DENGAN ELEKTRODA BERKONFIGURASI TITIK BIDANG Nur, Muhammad; Anam, Choirul; Arisa, Betri
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
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An analysis of Electrohydrodynamic (EHD) phenomenon deformation of oil silicon surface has been done.The negative corona glow discharge plasma in this research is generated by plasma generator system in point to plane electrodes configuration. The first step of experiment is to determine correlation of voltage and electric current, and correlation of distance between electrode and electric current. Then, the second is to determine correlation of voltage and hole radius of oil silicon surface, and corelation of distance between electrode and hole radius of oil silicon surface. Finally, it is to determine  the velocity hole for back to initial position of oil silicon surface after turn off electric field. The EHD phenomenon of oil silicon can be generated by impose of non homogeneous high electrics field. The voltage of corona at distance between electrodes 1 cm, 1,5 cm and  2 cm are 2,6 kV-4 kV,  3,4 kV-5,2 kV, and  3,8 kV-6,0 kV respectively. The increase of electrics field intensity influence dipole moment strength, it increases the radius of the hole of oil silicon surface. The increase of distance between electrode influence parabolic angle of electrics line field then cause the increase of hole radius. After this, if the electric field is zero with  increasing voltage, velocity hole of  oil silicon for back to initial position  slower then if the increasing of h, that makes the velocity hole for back to initial position faster.   Key words: Electrohydrodynamic, Silicon Oil, Dielectric polarization, Positive corona glow discharge plasma, ionic wind.
PENGARUH VARIASI JARAK DETEKTOR, LUAS LAPANGAN RADIASI DAN POSISI DETEKTOR DARI PUSAT BERKAS RADIASI MENGGUNAKAN MULTI PURPOSE DETECTOR (MPD) PADA PENGUKURAN TEGANGAN SINAR-X Bertua Simamora, Evi Handriani; Anam, Choirul; Setiawati, Evi
YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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An evaluation of the distance effect of Multi-Purpose Detector (MPD)-X ray source, variations of field size of radiation and position of the MPD on the X-ray voltage measured, have been done. There are necessary because they have not been recommended from the MPD procedure manual yet. The detector operated at voltage of 70 kV and current-time of 12.5 mAs. The measurement of voltage using MPD from RTI Electronics product. It is multifunction detector that can measure dose and voltage invasively. The previous step is measurement of dose for ensure correct equipment setting. These measurements is done for several variations such as MPD-X ray distance of  60 - 160 cm, field sizes 0f 4x4 cm - 40x40 cm2, detectors position of 0 (at center of beam) and 1-11 cm from centre of beam.   The results are obtained that the voltage that measured is not affected by all of variation values such as distance difference of MPD-X ray source,  field sizes and detectors position. Furthermore, for measurement of outside of radiation beam, MPD   can still measur voltage with good validation. Therefore, the measurement of voltage using MPD has high flexibility because it is not influenced by set up measurement.Keywords: The X ray voltage measurement, Multi-Purpose Detector (MPD), Barracuda.
REKONSTRUKSI CITRA CT DENGAN METODE BACK PROJECTION (BP) DAN ALGEBRAIC RECONSTRUCTION TECHNIQUE (ART) MENGGUNAKAN MATLAB Nur Anisa, Ariyanti; Setiawati, Evi; Anam, Choirul
YOUNGSTER PHYSICS JOURNAL Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : YOUNGSTER PHYSICS JOURNAL

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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
Pengukuran Laju Paparan Radiasi Sinar-X Pada Ruang Operator RSUD. Prof. DR. W. Z. Johannes Kupang Leitabun, Yoel Midel; Sutanto, Heri; Anam, Choirul
YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
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The measurement of X-ray radiation exposure rate in operator’s room with Pb glass at the Prof. Dr. W. Z. Johannes hospital, Kupang has been done. The measurement of radiation exposure rate for radiation before and after passing through the Pb glass was done using surveymeter. There are six points of measurement: at the upper-left, upper-right, upper-midle, bottom-left, bottom-right, and bottom-midle sides. The results of measurements show that Pb glass reduce the radiation exposure rate until 99,51%, and when flouroscopy is activated, the radiation exposure rate at the operator’s room is 0,6 mR/hour. This value is below the value of dose limit (NBD). Keywords: radiation exposure rate, Pb glass, radiaion at the operator’s room
KEMAMPUAN SEGMENTASI MENGGUNAKAN METODE DRLSE (DISTANCE REGULARIZED LEVEL SET EVOLUTION) TERHADAP PENGARUH DERAU Noor Fajrin, Abdillah; Adi, Kusworo; Anam, Choirul
YOUNGSTER PHYSICS JOURNAL Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : YOUNGSTER PHYSICS JOURNAL

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Abstract DRLSE (Distance Regularized Level Set Evolution) Segmentation has been tested in this research under salt & pepper noise, gaussian and speckle influence. DRLSE uses curve fluctuations to carried segmentation. First process, image was be activated by using each noise (gaussian, speckle, and salt & pepper). Afterwards, it was be carried to segmentation under DRLSE. Image activating by distinct noise will shows us DRLSE performances under noise influences. The result show us maximal variants value of following noise as follow: in the image gourd is salt & pepper 0.002, gaussian 0.002 and speckle 0.007. image dua objek is salt & pepper 0.004, gaussian 0.0001 and speckle 0.008. Keywords :segmentation,salt & pepper, gaussian, speckle.
Co-Authors - Basyirun - Romadhon Abdillah Noor Fajrin Abdul Muqsith Achmad Fauzi Achmad Helmy Djawahir Adi Pamungkas Agustia Dwi Pamujiati Alan Tanjung Aji Prastowo Alfaris, Hasan Bisri Isa Alfian Rizani Ali, Mohd Hanafi Aly, Moh. Aziz Ana Amiroh, Ana Andri Febrianto, Andri Anugrah Ariyani S. Argus Argus, Argus Arifin, Muhyiddin Zainul Ariyanti Nur Anisa Armanu Thoyib Aulia Sabrina, Aulia Basito Basito, Basito Betri Arisa Cahyo Indarto Catur Edi Widodo Catur Edi Widodo Catur Retnaningdyah Chumaidi, Moch. Chumaidi, Moh. Conoras, Moch El Bahar Dewi Dewandari, Dewi Dewi Kusrini Dewi Tri Nugraheni, Dewi Tri Dougherty, Geoff Dwi Ishartani Dwi Siwi Retnoningsih Edhi Nurhartadi Eko Hidayanto Erlyna Wida R, Erlyna Erlyna Wida R, Erlyna Wida Erlyna Wida R., Erlyna Wida Esti Widowati, Esti Evi Handriani Bertua Simamora Evi Setiawati Farhatin Nurul Ihya Fatkhiyatul Athiqoh Fitri Susanti Freddy Haryanto Gusti Ngurah Sutapa Habibah, Rakhmi Handini Devi Yunitasari HARRY BUDI SANTOSO, HARRY BUDI hartanto hartanto Heri Sutanto Herlina Herlina Hidayat, Junaidi Hidayat, M. Junaidi Hima, Mulk I Wayan Ari Makmur Intan Andriani Japeri Japeri Jujun Septiadi K Sofjan Firdausi K. Sofjan Firdausi Kareng, Yaya Khadafi, Shah Khumaidi, Ach. Kusworo Adi Laily, Rysda Aina Luchman Hakim M IRFAN, M Mahfudz Fauzan Maman Herman Masdi Masdi Masyan, Ali Miftahul Huda Much Azam Muhammad Khumaedi Muhammad Nur Mukhtar Hanafi Nindyapuspa, Ayu Nugroho Agung, Nugroho Nur Dwi Prasetyo Nur Heriyadi Parnanto Nur Paramita Nira Mulyono Nur Rochman, Alfan Nurhadi Nurhadi Nurul Firdausi Nuzula, Nurul Firdausi Oktavia, Armida Oktaviona, Lupita Parnanto, Nur Her Priyono Priyono Puput Khusnaiatul Rinaldi, Ade Rizky Riris Trima Derita Sari Rokhmah, Laela Nur Rustanto, Dwi Ryan Kurniawan Sabiliat, Nur Edy Samponu, Yohakim Benedictus Sanggam Ramantisan Sirojudin Sirojudin Siswanto, Rizal Adi Siti Maesaroh Siti Nur Endahyani Sri Adikadarsih, Sri Sri Handayani Suhardi Suhardi Suharningsih Suharningsih Sujono - Sumardi - Suminar, Nor Syah, Iwan Nur Dian Syaikhuddin, Muhammad Miftakhul Tri Winarni Agustini Tri Wulan Tjiptono Trisna Budiwati Vincensius Gunawan Virgia Ningrum Fatnar, Virgia Ningrum Wahyu Setia Budi Wahyu Setiabudi Windi Atmaka, Windi Wiwit Wulan Yuniati Yoel Midel Leitabun Yuli Witono Zaenal Arifin