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Efita Pratiwi Adi
Jurusan Fisika, Universitas Jenderal Soedirman
Astronomy Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Optimasi Pemisahan Perak dari Limbah Fixer melalui Variasi Tegangan Efita Pratiwi Adi; Hartono Hartono; Zaroh Irayani; Adilla Luthfia; Adam Mulawarman
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 1 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i1.352

Abstract

Fixer solution is a chemical substance in the form of a concentrated liquid that is used to wash radiographic films. The Fixer Solution functions to dissolve the silver halide layer on unexposed radiographic films. This research aims to design a waste fixer solution processing device using the electrolysis method and to regulate the voltage to the optimal point to produce a large electrolysis rate. Design an electrolysis device using stainless steel electrodes with a trapezoidal cathode with parallel sides of the cathode with lengths of 170 mm, 145 mm and a cathode height of 155 mm. The anode is rectangular with a length of 30 mm and a height of 169 mm. The method for making tools goes through several stages, namely making tool designs, testing tools, and testing waste fixer solution. The fixer waste used comes from Betesdha Wonosari Hospital. In this research, each test used 5 liters of fixer waste at each voltage which was regulated for 3 hours. The higher the mass voltage produced, the higher the electrolysis rate will be. However, the higher the voltage, the faster the sulfidation process will be. In the design of this fixer waste management tool, it can work optimally at a voltage of 4 V with a speed of 4.87 g/hour.
Rancang Bangun Penambahan Agitasi pada Alat Pengolah Limbah Fixer dengan Metode Elektrolisis Efita Pratiwi Adi; R. Farzand Abdullatif; Zaroh Irayani; Hizas Azizi
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 01 (2025): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v13i01.452

Abstract

The bubble layer that appears on the electrode causes the surface area of ​​the electrode that interacts with the electrolyte to decrease. This inhomogeneous bubble layer and electrolyte will inhibit the rate of electrolysis. One of the actions to reduce the bubble layer on the electrode and keep the electrolyte homogeneous is by agitation. This study aims to make modifications by adding agitation to the fixer solution waste processing tool with the electrolysis method. The container used is made of plastic with a diameter of 17 cm and a height of 19 cm. The electrodes used are made of 0.8 mm stainless steel with a width of 5 cm and a total length of 18 cm and the length that enters the fixer waste is about 13 cm with a distance between electrodes of 3.5 cm. The tool testing was carried out without agitation and with agitation. Each test will be carried out with voltage variations of 4V, 6V, 8V and 10V. Each test will use 3 liters of fixer waste with a time of 1 hour. The results of this study obtained that the designed tool can work well at a voltage of 4V to 10V and a capacity of 3L, with agitation proven to increase silver mass recovery up to 87.38% with a silver recovery rate at a voltage of 4V of 1.93 g/hour, at a voltage of 6V the silver recovery rate is 2.08 g/hour, at a voltage of 8V the silver recovery rate is 2.24 g/hour and at a voltage of 10V the silver recovery rate is 3.44 g/hour. Adding agitation to the fixer waste processing equipment, it can reduce the sulfidation that occurs and increase the silver mass significantly compared to without agitation. Keywords: Fixer waste, agitation, electrolysis, silver.
Pengaruh Arus Waktu Dan Tebal Abdomen Terhadap Diagnostic Reference Level Pada Pemeriksaan CT Scan Abdomen Efita Pratiwi Adi; Agus Sholeh; Intan Nailussalam; Adilla Luthfia; Muflihatun
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 02 (2026): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v14i02.639

Abstract

Pemeriksaan CT Scan abdomen menghasilkan dosis radiasi tinggi yang dapat membahayakan pasien sehingga diperlukan Diagnostic Reference Level (DRL) sebagai acuan dalam penerimaan dosis radiasi tinggi untuk memastikan keselamatan pasien sesuai dengan prinsip ALARA (As Low As Reasonably Achievable). Penelitian ini dilakukan untuk menentukan DRL CT Scan abdomen dan menentukan pengaruh arus waktu serta tebal abdomen terhadap CTDIvol dan DLP. DRL ditetapkan pada persentil ke-75 (kuartil ke-3) dari sebaran data dosis radiasi pasien berupa CTDIvol dan DLP. Data diperoleh dari 50 sampel pasien dewasa dengan klasifikasi umur 18-65 tahun yang menjalani pemeriksaan CT Scan abdomen kontras dan non kontras. Parameter yang digunakan yaitu arus waktu dan tebal abdomen. Hasil penelitian menunjukkan DRL CT Scan abdomen kontras yaitu CTDIvol sebesar 14,16 mGy dan DLP sebesar 675,66 mGy.cm, sedangkan DRL CT Scan abdomen non kontras yaitu CTDIvol sebesar 13,99 mGy dan DLP sebesar 675,66 mGy.cm. DRL untuk pemeriksaan CT Scan abdomen di Instalasi Radiologi RSUD Prof. Dr. Margono Soekarjo Purwokerto masih berada pada tingkat aman karena lebih rendah daripada I-DRL yang ditetapkan oleh BAPETEN. Hubungan antara dosis radiasi dengan arus waktu dan tebal abdomen adalah berbanding lurus. Dimana pengaruh ketebalan abdomen terhadap CTDIvol dan DLP lebih sebesar daripada arus waktu ditunjukan dengan gradien grafik hubungan tersebut.       Kata kunci CT Scan, Diagnostic Reference Level, CTDIvol, arus waktu, tebal abdomen.
Co-Authors Adam Mulawarman Adilla Luthfia Adilla Luthfia Agus Sholeh Hartono Hartono Hizas Azizi Intan Nailussalam Muflihatun R. Farzand Abdullatif Zaroh Irayani Zaroh Irayani