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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 PENERIMAAN DOSIS RADIASI DI ORGAN MATA PADA PEMERIKSAAN NASOFARING MENGGUNAKAN CT SCAN Masdi Masdi; Evi Setiawati; Choirul Anam
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTThe examination of nasopharynx CT Scan for the diagnosis tumors, was performed by two phase, plain phase and contrast medium phase, so will result in a very high radiation dose to the organs in the head especially the eyes. This study aimed to obtain the value of the radiation dose was received organ in the eye in patient who underwent nasopharynx CT Scan.  The study was begun by measuring the consistency of the output X-ray tube voltage (kVp Output). Furthermore, measurement of the radiation dose to the organ eye using TLD-100 chips were placed on the surface of the eye organ of the 22 different patients with sequences and spiral scan mode, and using the slice number between 24 to 39. Measurement technique was done by using a tube voltage and tube current time fixed at 130 kVp, 250 mAs, slice thickness and slice collimation of 4 mm and 6x2 mm.The result on the eye organ doses of nasopharynx CT Scan two phase with sequence mode to obtain eye organ dose value between 83.291 mGy to 101.571 mGy, whereas the spiral mode to obtain eye organ dose values varied between 89.536 mGy to 109.359 mGy, showing that the value of the eye organ dose spiral modes greater than mode sequence. The results also showed that the value of the eye organ dose received about one fifth of the value of the damage threshold of the eye lens dose of 500 mGy. Key words: Eye dose, CT Scan, thermoluminisence dosimeter (TLD)
ANALISIS KUALITAS MINYAK GORENG BERDASARKAN NILAI GRADIEN PERUBAHAN SUDUT POLARISASI MENGGUNAKAN METODE ELEKTROOPTIS Ekasari Ekasari; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Palm cooking oil quality testing has been done using natural polarization and electro-optics. Tests conducted to determine the quality of oil based active optical properties of the oil. The addition of external electric field aims to get the value of the polarization angle changes each brand oil. Oil samples were tested in the form of palm oil with a variety of brand new and has ditreatmen oil for frying foodstuffs. Test parameters after the addition of external electric field gradient that is of value elektrooptis. The test results, samples of oil to the value of large polarization angle gradient changes indicated have relatively low quality. Instead gradient small polarization angle, indicating high quality oil. Elektrooptis smallest gradient value of 0,51o/ kV, while the largest gradient value is 0,68o / kV. Keywords: polarization, elektrooptis, oil quality
RESPON PHOTOSTIMULABLE PHOSPHOR (PSP) PADA COMPUTED RADIOGRAPHY TERHADAP AKURASI TEGANGAN TABUNG DAN LINIERITAS KELUARAN PESAWAT SINAR-X Dwi Adhianto; Heri Sutanto; Zaenal Arifin
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research has been done to analyze Photostimulable Phosphor (PSP) in Computed Radiography (CR) responses related to exposure factor variation which usually used in determining of tube voltage accuracy and output linearity of X-ray machine. The aim of this research is to analyze of linear response of PSP to variation of exposure factor that related to usage of tube voltage in kVp and tube current-exposure time (mAs).The Method which used was exposing CR with an ascent of tube voltage 50 till 90 kVp with a constant tube current-exposure time in 0,5 till 16 mAs. Exposure Index, Deviation Index, and Indicated Equivalent Air Kerma (KIND) referred to  IEC standard 62494-1 at each expose and mean gray value of digital image were used as PSP responses. Those are related to kVp and mAs variation. The result was obtained that photostimulable phosphor response in Exposure Index and Deviation Index parameters had correlation coefficient >0.97 in logarithmic relation at all exposure factor variation. Parameter of Indicated Equivalent Air Kerma (KIND) referred to IEC standard 62494-1 had linier relation with >0.97 amount of correlation coefficient. Linearity coefficient was obtained 0.005-0.061 using IEC standard/mAs. Mean gray value had correlation coefficient >0.94 in logarithmic relation at using of steady tube voltage with the result that could be indicator of output linearity of X-ray machine. The result was obtained that mean gray value could be a tube voltage accuracy indicator at using of 0.5 till 8 mAs with correlation coefficient >0.83 amount.Keywords : computed radiography, exposure indicator, mean gray value, output linearity, tube voltage accuracy
Studi Metode Spektroskopi Plasma Laser Tekanan Rendah untuk Identifikasi Unsur Tembaga Ainul Ibnu Khotob; Wahyu Setia Budi; Ali Khumaeni
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 study on laser plasma spectroscopy has been conducted in Optoelectronics and Laser Laboratory, Physics Department, Diponegoro University, to identify the copper spectrums in samples of pure copper and copper alloys. In this study, some of the tested parameters are the comparison of ambient pressure, laser energy and types of sample. In comparative study on ambient pressure, the researcher compared the plasma laser and the spectrum that is constructed of pure copper at the pressure of 1 atm and 3 Torr with PFN 85%. The study on varieties of laser energy was conducted with the PFN values used on pure copper sampel which is at 3 Torr condition, between the range of 75%, 80%, 85%, 90% and 95%. In the test on sample types, the samples used are pure copper, commercial copper, brass key (Cu-Zn) and bronze coin (Cu-Al), at the pressur of 3 Torr and PFN 85%.. As the result, the plasma on ambient pressure of 3 Torr were formed bigger than at 1 atm and it has more clear and better colored spectrum. The higher value of laser’s PFN also lead to greater formed plasma. The dominant and consistent spectrums formed are Cu I 521,82 nm, Cu I 515,32 nm, Cu I 510,56 nm and Cu I 406,26 nm. Based on the calculation conducted by using the Boltzmann plot method, the value f plasma’s temperature that has been formed is rangen in value of 9503,37 – 10906,54 Kelvin.
ANALISA TINGKAT KONTAMINASI DOSIS NUKLIR DAN LAJU PAPARAN RADIASI PADA INSTALASI KEDOKTERAN NUKLIR Rafli Filano; Eko Hidayanto; Zaenal Arifin
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

The research has been analyzed the level of nuclear contamination and radiation exposure rate at installation of nuclear medicine with efforts a radiation protection is the prevention or decrease the number of entry of radioactive material into the human body. The method used to conduct measurement a count of contamination of surface work area resulting from the use of radioactive substances and carried out at a distance of 0.5 cm between the detector window with contaminated areas, while measuring the radiation exposure rate in each of center room at height of 1 meter from the surface of the floor in various rooms installation of nuclear medicine. The results of measurement obtained levels of contamination nuclear dose in various rooms installation of nuclear medicine is from 0,16 to 243 Bq/cm2 were classified as low to high levels of contamination. While the results of measurements of the radiation exposure rate is from 0,026 to 1,693μSv/h, which is classified as below the allowable dose value level, so it is still safe for radiation workers and other patients. Keywords: Radiation Protection, Radioactive, Contamination, Radiation Exposure Rate, Nuclear Medicine
Pemodelan 2D sistem pana bumi daerah Garut Bagian Timur menggunakan metode magnetotelurik Riznia Aji Salam; Udi Harmoko; Tony Yulianto
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research was conducted in the eastern part of the Garut area using magnetotelluric method that aims to create 2D model of the geothermal system based on distribution of rock resistivity value. Magnetotelluric method is used because it is able to identify subsurface structure to a depth of thousands of meters. In this research, the data measured from 9 different targets area and processed based on the flow such as converting time domain data into the frequency domain, identify noise data, perform two-dimensional inversion modeling and create geothermal systems. Based on the results, also compared with the interpretation of geological data and geochemistry of rocks known clay cap, reservoir, and hot rock. Furthermore, Clay cap has a value of 4-32 Ωm resistivity on depth of 3000 m. Reservoir rock with resistivity value of 64-512 Ωm at a depth of 1500-5000 m. While hot rock with 1024-8192 Ωm resistivity value is under the reservoir rock.Keywords: Magnetotelluric, Eastern section of the Garut, geothermal system, resistivity
RANCANG BANGUN ALAT PENGUKUR DISTRIBUSI KUAT PENERANGAN MULTI TITIK MENGGUNAKAN SISTEM KOMUNIKASI RS485 Indri Trifiantari; Suryono Suryono
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

ABSTRACT Meassuring illuminance system was created used multipoint model. The used light sensor was LDR that created used voltage devider model . AVR ATMega8535 microcontroller was used as a data acquisition device and a serial data transmission to a computer. Output of sensor was inserted into the microcontroller ADC input at ADC0 pin. Measured data of the LDR sensor would be processed by AVR ATMega 8535 microcontroller, then sent to a computer using a serial RS485 protocol. The data was interfaced with Borland Delphi7 and saved on Microsoft Excel. From this research, it was found the measurement from 4 terminal systems which each terminal sistem consist of one measurement point. From the four test systems performed by standard luxmeter obtained equipment precision of device that is made between R = 94.84%, until R = 99.05%. Key words: Illumination, LDR, RS485 communication system
PENENTUAN INDEKS BIAS DARI KONSENTRASI SUKROSA (C12H22O11) PADA BEBERAPA SARI BUAH MENGGUNAKAN PORTABLE BRIXMETER Tiffany Rahma Novestiana; Eko Hidayanto
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

One of the determination of the quality of the juice is concentration. Concentration can determine the value of the refractive index with a refractive index with a Abbe Refractometer. This experiment was determined the value of the refractive index of branded fruit juices using Portable Brixmeter was to get correlation between refractive index and concentration and correlation between concentration and length of measurement, and quality of fruit juice using Portable Brixmeter. The research was conducted by dilution and observation of length time measurement of fruit juice concentration. Data were analized by approach linier charts for dilution, while the length of time measurement of juice concentration with quadratic approach of polynomial. The amount of sucrose liquid concentration is comparable with its refractive index. Correlation between liquid concentration of C sucrose with refractive index n in pure sucrose (ns):0,0018C+ 1,3270 for fruit juice of guava, orange, apple, and soursop respectively (nja):0,0013C+1,3336; (nje):0,0014C+1,3334; (na):0,0015C+1,3329 and (nsi):0,0014C+1,3331. According to the length measurement of the concentration, the longer of time measurement decreased the concentration value. Concentration equation contained fruit juice taste guava, orange, apple, and soursop respectively: (Cja):-0.0016t2+0.0199t+13.365; (Cje):- 0.0062t2+0.0916t+11.444; (Ca):-0.0024t2-0.0016t+12.472 and  (Csi):-0.0032t2+0.0015t+12.158. Keywords: refractive index, sucrose concentration, portable brixmeter, fruit juice.
IMPLEMENTASI OBJECT TRACKING UNTUK MENDETEKSI DAN MENGHITUNG JUMLAH KENDARAAN SECARA OTOMATIS MENGGUNAKAN METODE KALMAN FILTER DAN GAUSSIAN MIXTURE MODEL Havez Vazirani Al Kautsar; Kusworo Adi
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

Traffic density can be controlled by obtaining and managing the data of the traffic flows on the highway. Generally, the process of data acquisition of the traffic flows which passing on the highway are still done manually by assigning some officers to be on the highway and count each of passing vehicle, then divided by a certain time frame. This manual counting are still have many weaknesses such as time of collecting data become longer, and need much amount of the human resources. Based on these conditions, needs an accurate automatic vehicle detection and counting system as traffic monitors, traffic controllers and traffic analysis. At this time, it has been developed a vehicle detection system using a hardware system such as using sensors, Radio Frequency Identifier or other hardware which integrated by software in the microcontroller and works automatically to detect the speed and count the number of passing vehicles on the highway. The weaknesses of these detectors can only detect at the narrow range, design of the system, the complexity of the operation, and also has a significant operational cost. Based on those system weaknesses, this study was developed with a focus of designing the detection system and the vehicle counter system using Kalman filter and Gaussian Mixture Models (GMM) method. This system get the most accurate results in the morning (10,000-25,000 lux illumination) with F1 Score value of 0.91111, while counting the vehicles most inaccurate happen at night (illumination from 0.27 to 1.0 lux) with F1 Score only 0.16071.Keywords: Traffic flows data, vehicle counter system, Object Tracking, Gaussian Mixture Model, Kalman Filter.
PENGARUH TEMPERATUR SINTERING TERHADAP SIFAT OPTIK LAPISAN TIPIS ZINC OXIDE (ZnO) YANG DIDEPOSISI DIATAS SUBSTRAT KACA DAN APLIKASINYA UNTUK MENDEGRADASI PEWARNA METHYLENE BLUE Nur Hasim Efendi; Heri Sutanto
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

In this research, ZnO  thin films have been successfully deposited on glass substrates by spraycoatingtechniquewith avariety the sintering temperature of 300 °C , 400 °C , 450 °C and 550 °C. Optical properties ZnO thin films were characterized by using UV-Vis spectroscopy. The ability ofphotocatalyst of ZnOfordegradation ofmethylene bluecolorwas observedthrough the absorbance test by using UV-Vis to obtain the percentage of color degradation. The results showed that the sintering temperature of ZnO affects the value of energy Gap of ZnO thin film. Higher sintering temperature resulted in higher energy gap. The largest gap energy generated from the ZnO sintering temperature of 450 ˚ Cwith values Eg 3.03 eV. ZnO photocatalyst activity of test results have been able to degrade methylene blue up to 97.62% were obtained from ZnO thin layer of sintering temperature of 450 ˚ C.Keywords: Photocatalyst, Spray coating, ZnO, Band gap energy, Methylene blue, Sintering temperature.

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