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I Ketut Putra
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Analisis Energi Potensial Gempabumi pada Zona Subduksi Wilayah Bali Ni Putu Juliyant Ananda Rika Pangastuti; Komang Ngurah Suarbawa; I Ketut Putra; Ni Luh Desi Purnami
BULETIN FISIKA Vol 23 No 2 (2022): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i02.p09

Abstract

Research has been carried out to analyze the potential energy of earthquakes in the subduction zone in the Bali region which aims to determine the seismicity index, a-value, b-value, return period and earthquake potential energy in the Bali region at coordinates 114.2º east longitude - 115.9º east longitude and 11 ,7º south latitude – 7.5º south latitude. Earthquake data used in the form of the date and time of the earthquake, earthquake coordinates in the form of latitude and longitude, earthquake depth and magnitude. The research was conducted using secondary data from the USGS (United State Geological Survey) earthquake catalog from 1970 to 2020 with a magnitude of 3-10. The data is modeled using Arc Gis software to obtain a seismicity map. The seismicity index, a-value, b-value, return period and earthquake potential energy were obtained using the least square method. Obtained a-value = 5.3 and b-value = -0.74, a seismicity index of 0.083 and an earthquake return period with a tested magnitude of M0 of 6 Mb of 12 years. The earthquake potential energy for this subduction zone is also obtained at 3,616×1014 J.
Analisis Labilitas Atmosfer Pada Peristiwa Hujan Lebat Di Wilayah Bali Selatan (Studi Kasus: Kejadian Banjir 5 dan 6 Desember 2021) Anin Nuril Firdausi; I Made Yuliara; Kadek Sumaja; Komang Ngurah Suarbawa; Putu Suardana; I Ketut Putra
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i01.p10

Abstract

An analysis of the occurrence of atmospheric lability was carried out when heavy rains occurred in the South Bali region, namely when a flood occurred on December 5 and 6 2021. The purpose of this research was to determine the atmospheric conditions based on weather parameters and atmospheric lability in three areas of South Bali, namely the City Denpasar, Tabanan Regency and Badung Regency. The research data is secondary data including synoptic observation data of rainfall intensity on 5-6 December 2021, ECMWF Reanalysis data, Himawari Satellite imagery data, and upper air observation data (Radiosonde). These data were analyzed based on local weather factors and atmospheric lability. It was found that on December 5, 2021, the air temperature in the atmosphere was relatively high at 14 o'clock. 00 WITA with relative humidity ranging from 82%-88% and relatively low on December 6 at the same hour with relative humidity decreasing to 78%. The wind speed has increased to 12.8 Knots from 5 to 6 December and atmospheric lability has changed by 94.3%. Even so, there is still rain with moderate intensity accompanied by thunderstorms.
Determination of Critical Organ Effective Dose in Head CT Scan Examination at Bali Mandara Hospital Sutapa, Gusti Ngurah; Winer Johan Bora; I Gde Antha Kasmawan; Ni Kadek Nova Anggarani; I Ketut Putra; Ni Putu Yuni Nurmalasari
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.28471

Abstract

The study aims to determine the effective dose to critical organs in head CT scans at RSUD Bali Mandara and analyse the difference in effective dose between male and female patients and compare it with BAPETEN's normal threshold. Secondary data including current, voltage, CTDIvol, and DLP were collected and grouped by gender. The effective dose was calculated by multiplying DLP by the conversion factor K and CTDIvol by the organ weight factor (WT). The mean effective dose of male patients was 4.35 ± 0.68 mGy, while that of female patients was 4.00 ± 0.53 mGy. The effective dose of critical organs for males was 0.642 mGy and for females 0.613 mGy, with higher doses for males. Statistical analysis using t-test shows the value of tcount < ttable, which indicates that the effective dose in head CT scan examination at RSUD Bali Mandara is still within normal limits according to the BAPETEN DRL standard Number: 1211/K/V/2021.
The Effect of Focus Film Distance Variation on Patient Absorbed Dose in Thorax Examination with Roentgen Machine in Radiology Installation of Sanjiwani Hospital Gianyar I Nyoman Yosua; Gusti Ngurah Sutapa; I Ketut Putra; Ida Bagus Suryatika; Hery Suyanto; Ida Bagus Alit Paramarta
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.28113

Abstract

A study has been conducted on the effect of Focus Film Distance (FFD) variation on patient absorbed dose during thorax examination at the Radiology Installation of Sanjiwani Hospital, Gianyar. This study aims to determine the effect of FFD variation and the suitability of the radiation dose received by patients whether it is still within the limits of BAPETEN's decision. The X-ray machine used was Siemens Luminos Fusion Roentgen with the FFD variation method given a distance of 110 cm, 130 cm, and 150 cm in 30 patients. Dose measurements were carried out based on radiation exposure and analyzed according to BAPETEN standards. The results showed that the greater the FFD value, the smaller the absorbed dose received by patients. The highest absorbed dose obtained for FFD 110 cm was 0.3867 mGy, 130 cm was 0.2769 mGy, and 150 cm was 0.2079 mGy below the maximum limit of 0.4 mGy set by BAPETEN, so it is safe for patients. Statistical analysis of one-way t-test showed significant results, with thitung < ttabel. This indicates that FFD variation affects the absorbed dose, and all doses remain within safe limits. Thus, thorax examination at RSUD Sanjiwani Gianyar has met the established safety standards.
Measurement of Natural and Artificial Radiation as Well as Radiation Applications in The Field of Medical Physics at SMA Negeri II Kuta Badung Bali Sutapa, Gusti Ngurah; I Gde Antha Kasmawan; Ida Bagus Made Suryatika; I Made Yuliara; Ni Nyoman Ratini; I Gusti Agung Ayu Ratnawati; Ni Luh Putu Trisnawati; I Ketut Putra; Ni Kadek Nova Anggarani
Kappa Journal Vol 8 No 3 (2024): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i3.28254

Abstract

The results of research that have been carried out, especially in the field of medical physics such as X-rays, have been widely utilized in the medical field, especially Radiology Units in Several General and Regional Hospitals. Thus, it is very important to be understood and known by the community, especially the community, in this case the students of SMA Negeri 2 Kuta. In 2022/2023, there are 507 male and 597 female students. Seeing these conditions, surveys and observations were carried out as a result, students had difficulty understanding physics because the physics subject matter was dense, memorized and mathematical. Seeing these results, it is necessary to carry out a new paradigm in physics learning. One of the more appropriate methods is to balance theory learning with field applications such as natural and artificial radiation measurements and applications in the field of medical physics. The results of natural radiation measurements in the classroom and outside the classroom were 0.605 ± 0.0024 and 0.182 ± 0.0008 mSv/year, respectively. The limit of the dosage rate allowed by BAPETEN is 1,000 mSv/year. Natural radiation identified in the classroom and outside the classroom is still declared safe
Comparison of Seismicity Between the Subduction Zone and Local Fault Zone in the Bali Island Region During the 1963–2023 Period Using the Likelihood Method Nainggolan, Putri Srimalemta; Winardi Tjahyo Baskoro; I Gusti Ketut Satria Bunaga; I Ketut Sukarasa; Nyoman Wendri; I Ketut Putra
Kappa Journal Vol 9 No 2 (2025): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.30243

Abstract

Research has been conducted on the comparison of seismicity between the subduction zone and the local fault zone in the Bali Island region during the 1963–2023 period. This research aims to compare the b-value, a-value, seismicity index, and earthquake recurrence period between the subduction zone and the local fault zone. The research was conducted within the observation boundaries of 114,4°–115,7° East Longitude and 11,4°–8,8° South Latitude. The research was carried out at the Center for Meteorology, Climatology, and Geophysics Region III Denpasar using the likelihood method for earthquakes with magnitude ≥ 3,3. The data used were obtained from the official websites of the USGS (United States Geological Survey) and BMKG, with depths ≤ 600 km for the subduction zone and depths ≤ 35 km for the local fault zone. The results show that the subduction zone has a b-value of 0,534 and an a-value of 4,599, while the local fault zone has a b-value of 0,829 and an a-value of 5,087. The seismicity index in the subduction zone ranges from 0,289–13,046 with an earthquake recurrence period of 0,077–3,459 years. Meanwhile, in the local fault zone, the seismicity index ranges from 0,126–8,366 with an earthquake recurrence period of 0,212–7,949 years. Earthquake distribution is dominated in the subduction zone at 82,63% compared to the local fault zone at 17,37%.
Co-Authors Anin Nuril Firdausi Gusti Ngurah Sutapa Hery Suyanto I Gde Antha Kasmawan I Gusti Agung Ayu Ratnawati I Gusti Ketut Satria Bunaga I Made Yuliara I Nyoman Yosua Ida Bagus Alit Paramarta Ida Bagus Made Suryatika Ida Bagus Suryatika Kadek Sumaja Komang Ngurah Suarbawa Nainggolan, Putri Srimalemta Ni Kadek Nova Anggarani Ni Luh Desi Purnami Ni Luh Putu Trisnawati Ni Nyoman, Ratini Ni Putu Juliyant Ananda Rika Pangastuti Ni Putu Yuni Nurmalasari Nyoman Wendri Putu Suardana Sukarasa, I Ketut Winardi Tjahyo Baskoro Winer Johan Bora