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All Journal Jurnal Spektra Makara Journal of Science
Djarwani S. Soejoko
Medical Physics and Biophysics Division, Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia
Physics

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KARAKTERISASI MASKER TERMOPLASTIK SEBELUM DAN SESUDAH RADIASI Nurhamiyah, Yeyen; L. Juwono, Ariadne; Soejoko, Djarwani S.
Jurnal Spektra Vol 15, No 2 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Masker fiksasi dipakai pada radioterapi sebagai salah satu alat bantu agar pasien tidak bergerak selama proses radioterapi. Masker fiksasi ini biasanya diimpoor dari luar negeri tanpa tahu kandungan bahan di dalamnya.Oleh karena itu, pada penelitian ini, bahan masker fiksasi bekas pasien radioterapi dianalisa untuk diketahui jenis polimer penyusunnya. Dengan melakukan serangkaian pengujian yakni pengukuran massa jenis, X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-Ray Spectrometry (EDAX) diketahui bahwa bahan masker fiksasi adalah polimer termoplastik Polycaprolactone. Dari hasil pengujian XRD didapat jika masker fiksasi memiliki system Kristal ortorombik dengan parameter kisi yang sedikit berbeda pada bahan yang terkena radiasi dan yang tidak terkena radiasi. Selain itu dari hasil pengujian diketahui bahwa pemakaian terus-menerus pada masker fiksasi tidak begitu mempengaruhi sifat fisik material ini. Walaupun demikian pada pengujian FTIR menunjukkan jika pada bagian bahan yang mendapat radiasi secara terus menerus akan membuat gugus –CH3 menghilang dan membentuk gugus =CH2. Kata Kunci : Fiksasi, Radioterapi, Polycaprolactone.
KARAKTERISASI MATERIAL BAHAN FIKSASI Ramadhan, Agie; L. Juwono, Ariadne; Soejoko, Djarwani S.
Jurnal Spektra Vol 15, No 2 (2014): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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Alat fiksasi sebagai alat bantu radioterapi merupakan alat penentu posisi pasien pada saat pasien kanker mendapat terapi dengan penyinaran (radioterapi). Alat fiksasi ini berbahan dasar polimer dan merupakan salah satu alat yang di-import. Dengan bertambahnya jumlah penderita kanker di Indonesia dan penderita memerlukan radioterapi maka kebutuhan akan alat ini juga semakin bertambah. Telah dilakukan penelitian melalui serangkaian pengujian untuk mengetahui jenis material dari polimer pembentuk alat fiksasi.Dengan melakukan pengujian sifat fisik dan kimia dari bahan polimer alat fiksasi, dapat ditentukan bahwa bahan dasar alat fiksasi adalah polimer polycaprolactone (PCL).Dengan mengetahui jenis bahan polimer, sifat fisik, dan sifat kimia bahan fiksasi, diharapkan Indonesia dapat memiliki kebijakan untuk memproduksi alat fiksasi sehingga ketergantungan bahan import untuk keperluan radioterapi dapat dikurangi di masa mendatang. Kata kunci: polimer, alat fiksasi, polycaprolactone (PCL)
SPEKTROSKOPI INFRAMERAH SENYAWA KALSIUM FOSFAT HASIL PRESIPITASI Soejoko, Djarwani S.; Wahyuni, Sri
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Infrared Spectroscopy of Precipitated Calcium Phosphate Compound. Samples of calcium phosphate compounds were produced from saturated solutions containing of calcium and phosphate ions. The experiments were carried out using solutions at temperature 25 º C and 70 º C, combined with different pH value of 5, 7, 9 and 11. Precipitation mass from solutions at 70 º C was relatively higher compare to that produced from solutions at 25 º C. It was also shown that generally the mass precipitation rose with the increasing of pH. Sample analyses were performed with the use of infrared spectroscopy, particularly for the samples produced from solutions at 70 º C. Based on the ν4 phosphate absorption band, it was indicated that apatite crystals found in most samples which its amount gave rise to the increasing of pH. Infrared spectroscopy of the heated samples produced with pH 11 showed that water molecules could be present either at the surface of crystals or trapped in the crystal structure.
SPEKTROSKOPI INFRAMERAH SENYAWA KALSIUM FOSFAT HASIL PRESIPITASI Soejoko, Djarwani S.; Wahyuni, Sri
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

Infrared Spectroscopy of Precipitated Calcium Phosphate Compound. Samples of calcium phosphate compounds were produced from saturated solutions containing of calcium and phosphate ions. The experiments were carried out using solutions at temperature 25 º C and 70 º C, combined with different pH value of 5, 7, 9 and 11. Precipitation mass from solutions at 70 º C was relatively higher compare to that produced from solutions at 25 º C. It was also shown that generally the mass precipitation rose with the increasing of pH. Sample analyses were performed with the use of infrared spectroscopy, particularly for the samples produced from solutions at 70 º C. Based on the ν4 phosphate absorption band, it was indicated that apatite crystals found in most samples which its amount gave rise to the increasing of pH. Infrared spectroscopy of the heated samples produced with pH 11 showed that water molecules could be present either at the surface of crystals or trapped in the crystal structure.
Co-Authors Agie Ramadhan, Agie Ariadne L. Juwono, Ariadne Sri Wahyuni Yeyen Nurhamiyah, Yeyen