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All Journal Indonesian Physical Review Jurnal Pepadu
Sri Herwiningsih
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Religion Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Physics Social Sciences

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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.  
EDUKASI BAHAYA BENCANA ALAM BAGI SISWA TK YA BUNAYYA KABUPATEN BLITAR SEBAGAI UPAYA MITIGASI BENCANA D.J. Djoko H. Santjojo; Sri Herwiningsih; Masruroh Masruroh; Muwardi
Jurnal Pepadu Vol 7 No 2 (2026): Jurnal Pepadu
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/pepadu.v7i2.11021

Abstract

Kabupaten Blitar memiliki potensi bencana alam yang tinggi karena terletak di kaki Gunung Kelud dan Gunung Kawi, dengan Kecamatan Wlingi sebagai salah satu wilayah rawan bencana. Berdasarkan kondisi tersebut, kegiatan pengabdian kepada masyarakat ini dilaksanakan di TK Ya Bunayya, Kelurahan Beru, Kecamatan Wlingi, dengan tujuan meningkatkan pemahaman anak usia dini tentang mitigasi bencana gunung meletus dan gempa bumi. Kegiatan dilakukan melalui sosialisasi interaktif menggunakan alat peraga edukatif serta pemetaan titik-titik evakuasi agar siswa dapat memahami tanda-tanda bencana dan langkah penyelamatan diri. Hasil kegiatan menunjukkan adanya antusiasme dan ketertarikan siswa dalam mempelajari kebencanaan di lingkungan sekitar, sekaligus siswa bisa praktek penerapan ilmu pengetahuan tentang kebencanaan dengan alat peraga. Kegiatan ini diharapkan menjadi langkah awal dalam membangun budaya sadar bencana di lingkungan sekolah dan masyarakat di Kabupaten Blitar.  
Co-Authors Abrar, Luthfia Aqila D.J. Djoko H. Santjojo Faisal Ahlan Rizaldi Fatimah Kunti Hentihu Johan Andoyo Effendi Noor Masruroh Masruroh Muwardi