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All Journal Jurnal Fisika Unand Indonesian Physical Review
Abrar, Luthfia Aqila
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Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Verifikasi Dosis Radiasi Berkas Foton 6 MV pada LINAC CLINAX CX Menggunakan Detektor Bilik Ionisasi di RSP Universitas Andalas Abrar, Luthfia Aqila; Milvita, Dian; Prasetio, Heru; Diyona, Fiqi
Jurnal Fisika Unand Vol 12 No 1 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.1.82-87.2023

Abstract

Telah dilakukan verifikasi dosis radiasi berkas foton 6 MV menggunakan detektor bilik ionisasi pada LINAC tipe CLINAX CX di RSP Universitas Andalas. Penelitian tersebut bertujuan untuk mengetahui dosis radiasi pada tiap variasi luas lapangan penyinaran serta menverifikasikan antara dosis radiasi pada Treatment Planning System (TPS) dengan dosis radiasi yang terukur. Penelitian diawali dengan pengukuran dosis radiasi pada slab fantom dengan kedalaman 10 cm dan variasi luas lapangan berbentuk persegi dan persegi panjang yang seluas (5x5) cm, (10x10) cm, (15x15) cm, (30x30) cm, (5x10) cm, (10x5) cm, (5x15) cm, dan (15x5) cm. Nilai dosis radiasi dihitung berdasarkan protokol TRS No.398 IAEA Selanjutnya dilakukan verifikasi dosis radiasi dengan membandingkan dosis radiasi pada TPS dengan dosis radiasi yang terukur pada batas toleransi yang ditetapkan oleh TRS No.398 IAEA yaitu ±2%. Hasil penelitian menunjukkan bahwa semakin besar luas lapangan penyinaran, maka semakin kecil dosis radiasi yang didapatkan. Hasil verifikasi dosis radiasi pada TPS dengan dosis radiasi terukur masih memenuhi batas toleransi yang ditetapkan oleh protokol TRS No.398 IAEA yaitu 0,076% hingga 0,584%.
RADIOLOGICAL CHARACTERISTICS OF 3D-PRINTED PETG AND TPU AT DIFFERENT INFILL PERCENTAGES FOR BREAST CANCER RADIOTHERAPY BOLUS Abrar, Luthfia Aqila; Sri Herwiningsih; Johan Andoyo Effendi Noor; Faisal Ahlan Rizaldi; Fatimah Kunti Hentihu
Indonesian Physical Review Vol. 9 No. 1 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i1.531

Abstract

Skin-sparing effect causes the radiation dose at a certain depth to be higher than at the skin surface. A tissue-equivalent material namely bolus is required to increase the radiation dose to the skin surface. Conventional bolus is widely used, it poorly conforms to irregular surface, leading to air gaps and compromising dose distribution accuracy. The three-dimensional (3D) printing technology enables the fabrication of 3D-printed boluses to minimize the air gap in conventional bolus applications. In addition, 3D printing is allowed to modify its infill percentage and infill patterns, minimizing both printing time and material usage but resulting in different radiological and dosimetric characteristics. Therefore, it is crucial to evaluate the radiological characteristics of 3D-printed bolus before its application in breast cancer radiotherapy. In this study, the radiological characteristics of 3D-printed Polyethylene Terephthalate Glycol (PETG) and Thermoplastic Polyurethane (TPU) boluses at different infill percentages have been evaluated. This research utilized eight plate-shaped 3D-printed bolus samples with dimensions of 12 cm × 12 cm × 1 cm, at the infill percentages of 20%, 40%, 60%, and 80%. Each bolus sample was scanned using a CT-Simulator to determine its Hounsfield Unit (HU) values and linear attenuation coefficients. The obtained HU values were compared with the HU values of human tissues. The results indicate that both 3D-printed PETG and TPU boluses demonstrate similar equivalency to adipose tissue. Consequently, based on radiological evaluation, PETG and TPU materials are suitable for use in fabricating 3D-printed bolus for breast cancer radiotherapy application.  
Co-Authors Dian Milvita Faisal Ahlan Rizaldi Fatimah Kunti Hentihu Fiqi Diyona, Fiqi Heru Prasetio Johan Andoyo Effendi Noor Sri Herwiningsih