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Efek Variasi Arus Waktu Terhadap Dosis Efektif Radiasi Lensa Mata Pada Penggunaan Bismuth Shielding Pada CT-Scan Kepala Sihaloho, Monika Lestari; Sandi, Nengah; Bunawas, Bunawas; Irhas, Rozi
Kappa Journal Vol 7 No 1 (2023): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i1.15995

Abstract

A study has been carried out to determine the effect of time current variation on the effective dose of eye lens radiation on head CT scans. The aim of this study was to determine the effect of changing the flow of time on the effective dose of eye lens radiation and to determine the reduction in the effective dose of eye lens radiation when using bismuth shielding. The tools used are CT-scan, head mannequin, thermoliminescence dosimeter (TLD) calcium sulfate CaSO4;Dy, and bismuth shielding. The method used in this study uses the calculation of the effective dose of the 100 kV calibration curve from NuclindoLab and the equivalent dose. The measurement results show an average of each current of 31.540 mSv 100 mAs 43.947 mSv 150 mSv 59.808 msv 200 mAs 64.747 mSv 250 mAs, 137.083 mSv 300 mAs without bismuth and using bismuth 26.883 mSv 100 mAs 100 mAs, 27.847 mSv 27.84 mSv 200 mAs, 50.430 mSv 250 mAs, 81.334 mSv 300 mAs. Based on the results obtained, it is known that the effective dose obtained in the eye lens without bismuth is 67.42 ± 39.41 mSv and using bismuth is 48.85 ± 22.43 mSv with a dose reduction of 27%. As for efforts to reduce the dose received, it must be done by paying attention to the parameter settings on the CT-Scan examination such as voltage, current, slice thinkness, pitch and the use of protective equipment such as bismuth shielding.
Uji Kesesuaian Alat Proteksi Radiasi Berdasarkan Nilai Exposure Index (EI) di Rumah Sakit Bali Mandara Tamba, Chasbas Putra; Sutapa, Gusti Ngurah; Putra, Ketut; Sandi, Nengah; Gede Suharta, I Wayan; Kasmawan, I Gde Antha
Kappa Journal Vol 10 No 1 (2026): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v10i1.31760

Abstract

A study has been conducted on the suitability test of radiation protection equipment based on the Exposure Index (EI) at Bali Mandara Hospital. The data used in this study are primary data obtained by conducting X-ray irradiation on PPE, namely Apron, Gonad Shield, thyroid Shield, gloves, and glasses using an X-ray machine. Then the irradiation results are processed using a CR system machine to obtain EI values using variations in tube voltage of 80 Kv, 100 Kv, 130 Kv, and a time current of 18 mAs. From the results of the analysis that has been carried out, the average EI value was obtained with a tube voltage of 80 kV for Apron 1004.60 ± 1.72, gonad shield 1302.80 ± 1.94, Thyroid shield 1444.60 ± 1.63, glasses 1375.40 ± 1.72, gloves 1478.60 ± 0.93, for a tube voltage of 100 kV the EI value for the apron was 1511.20 ± 1.24, gonad shield 1697.80 ± 1.65, thyroid shield 1810.60 ± 1.57, glasses 1598.60 ± 1.33, gloves 1819.40 ± 0.75, for a tube voltage of 130 kV 1831.00±1.41, gonad shield 2090.60±1.21, thyroid shield 2129.00±2.00, glasses 2980.20±1.07, gloves 2114.00±1.41. The EI value obtained using 80 kV tube voltage is still within the limits set by PERKA BAPETEN No.8 of 2011, namely 1300-1800
Co-Authors Bunawas Bunawas Gede Suharta, I Wayan Gusti Ngurah Sutapa I Gde Antha Kasmawan Irhas, Rozi Ketut Putra Sihaloho, Monika Lestari Tamba, Chasbas Putra