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I Gde Antha Kasmawan
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Udayana University, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics Other

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Analisis Peak Ground Accerelation (PGA) di Kabupaten Karangasem Menggunakan Pendekatan Empiris Masitah, Siti; Sukarasa, I Ketut; Dedy Pratama, I Putu; Yuliara, I Made; Suryatika, Ida Bagus Made; Kasmawan, I Gde Antha
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.v9i1.28647

Abstract

Kabupaten Karangasem merupakan bagian dari busur kepulauan Sunda Kecil yang terbentuk akibat proses subduksi lempeng Indo-Australia kebawah lempeng Eurasia sehingga menyebabkan daerah tersebut rawan bencana gempabumi. Penelitian ini bertujuan untuk menentukan nilai peak ground acceleration (PGA) di Kabupaten Karangasem menggunakan rumus empiris terpilih. Data yang digunakan adalah data skunder yang diperoleh dari alat accelerograph tahun 2019-2023 dan data dari katalog BMKG tahun 1972-2022. Dalam menentukan nilai PGA digunakan metode empiris Donovan (1973), Esteva (1970), Mc.Guirre (1963), Fukushima Tanaka (1990), Setiawan (2012). Pada hasil penelitian menunjukkan bahwa rumus empiris Donovan cocok untuk diterapkan di Kabupaten Karangasem. Kabupaten Karangasem bagian timur memiliki tingkat bahaya bencana gempabumi paling besar dengan skala Intensitas VI MMI mencakup Kecamatan Karangasem dan Kecamatan Abang dengan nilai PGA tertinggi yaitu 96 gals.
Analysis of Radiation Dose Received by Radiation Workers With Physical and Biological Dosimeters in The Radiology Unit of Sanjiwani Hospital Mas Janudinata, Gde Ari; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Made Suryatika, Ida Bagus; Artawan, I Nengah; Trisnawati, Ni Luh Putu
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.v9i1.29539

Abstract

This study aims to evaluate the impact of radiation exposure on the health of radiation workers at RSUD Sanjiwani Gianyar over the past five years. The evaluation was conducted through a physical approach, measuring radiation doses using Thermoluminescent Dosimeter (TLD), and a biological approach by analyzing the total leukocyte count and its components, namely neutrophils, lymphocytes, monocytes, and eosinophils. The results showed that the highest radiation dose was received by radiology specialists at 0.921 mSv, followed by medical physicists at 0.905 mSv, and radiographers at 0.894 mSv. This variation reflects differences in radiation exposure levels based on each profession's tasks and positions. Leukocyte and component analysis indicated that all values were within normal ranges. Although statistical tests showed significant differences in neutrophil levels between professions, overall radiation doses and leukocyte levels were within the safe limits set by PERKA BAPETEN No. 4 of 2013. The findings underline that radiation protection measures at RSUD Sanjiwani have been effective in minimizing health risks from radiation exposure. However, regular dose monitoring and health evaluations are necessary to ensure long-term protection for radiation workers.  
Analisis Variasi Gantry Terhadap Distribusi Dosis Radiasi Kanker Otak Dengan Teknik Intensity Modulated Radiation Therapy (IMRT) Dali Sinaga, Ade Nisa; Sutapa, Gusti Ngurah; Amelia, Cory; Made Suryatika, Ida Bagus; Yuliara, Made; Antha Kasmawan, I Gde; Irhas, Rozi
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.v9i1.29557

Abstract

Penelitian mengenai Analisis Variasi Gantry Terhadap Distribusi Dosis Radiasi Kanker Otak Dengan Teknik Intensity Modulated Radiation Therapy (IMRT). dengan tujuan, untuk mengetahui pengaruh variasi jumlah sudut gantry terhadap distribusi dosis pada kasus kanker otak berdasarkan nilai HI,CI pada target kanker serta dosis maksimum pada organ at risk (OAR) menggunakan teknik IMRT. Penelitian dilakukan dengan variasi jumlah sudut gantry 4, 5 dan 6 dengan menggunakan 30 sampel. Kemudian dilakukan analisis data dengan menggunakan uji normalitas dengan uji t satu arah. Hasil penelitian menunjukkan bahwa, distribusi dosis pada PTV dengan nilai HI dan CI untuk variasi jumlah sudut 4,5 dan 6 arah sudut gantry adalah 0,118 dan 0,986; 0,116 dan 0,975; 0,108 dan 0,974. Sedangkan distribusi dosis maksimum OAR pada variasi 4,5 dan 6 arah sudut gantry untuk brainstem 4886,55; 4921,47; 4731,23; Eye R 2676,35; 2830,16; 3123,83; Eye L 3226,19; 3268,59; 3162,92; nervus optikus R 2396,23; 2775,52; 2796,94, nervus optikus L, 2939,97; 2983,12; 2912,47; lens R 789,76; 709,76; 717,32; lens L 738,31; 775,33; 724,02; chiasma, 4153,40; 4460,04; 4020,70. Berdasarkan nilai rata-rata tidak terdapat perbedaan antara nilai hasil perhitungan distribusi dosis dengan nilai ketetapan dosis maksimum dalam Radiation Oncology A Question-Based Review. Hasil penelitin ini menunjukkan bahwa perencanaan lapangan 4 arah sudut gantry memiliki hasil distribusi PTV yang lebih baik dan waktu penyinaran yang lebih siangkat dibandingkan dengan perencanaan 5 dan 6 variasi jumlah arah sudut gantry.
Radiation Dose Determination and Body Mass Index (BMI) Evaluation in Abdomen CT Scan Examination Patients Using the Size-Specific Dose Estimate (SSDE) Method Prawistya Putra, I Made Gede Mas; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Made Suryatika, Ida Bagus; Putra Adnyana, I Gusti Agung; Simpen, I Nengah
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.v9i1.29592

Abstract

A study has been conducted on determining radiation doses and evaluating body mass index (BMI) in patients undergoing CT-Scan Abdomen examinations using the Size Specific Dose Estimate Method at the Bali Mandara Radiology Installation. One of the factors that influences the radiation dose received by patients is the Body Mass Index (BMI). The Size Specific Dose Estimate (SSDE) method is used to assess radiation doses based on patient size, which is often associated with BMI. This study aims to determine the estimated radiation dose of each patient and evaluate the relationship between BMI and the dose received. This study used a CT-Scan brand SIEMENS SOMATOM PERSPECTIVE (serial number 78068). The population in this study were patients undergoing CT-Scan Abdomen examinations. The sample consisted of several BMI categories, namely thin, normal, overweight, and obese. The analysis was carried out using linear regression to measure the relationship between BMI and SSDE, as well as a one-way t-test to see the difference in the average SSDE value in each BMI category. The results showed that each increase in one BMI category caused an increase in SSDE values ​​of 1,566 mGy. The R² value of 98.56% indicated that the BMI category explained almost all of the variability in SSDE values. However, a one-way t-test statistic showed that there was no significant difference in the average SSDE values ​​in the thin, normal, overweight, and obese categories (F count <F table, so H₀ was accepted). This study showed that patients with higher BMI tended to receive higher radiation doses, but the differences between categories were not statistically significant.
Distribution of Radiation Doses Received by Organs at Risk in Cervical Cancer Using Intracavitary Brachytherapy Technique Anandika Putra, I Made Raditya; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Ratini, Ni Nyoman; Wibawa, I Made Satriya; Putra, I Ketut
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.v9i2.29017

Abstract

A study entitled Distribution of Radiation Doses Received by Organs at Risk in Cervical Cancer Using Intracavitary Brachytherapy Technique has been conducted. The study was conducted at the Radiotherapy Sub-Installation of Prof. Dr. I.G.N.G Ngoerah Hospital with the aim of determining the distribution of doses received by High Risk Clinical Target Volume (D2cc) and Organs at Risk (D90). Determining the distribution of doses received by High Risk Clinical Target Volume (D2cc) and Organs at Risk (D90) in cervical cancer patients is still within the recommended limits in ICRU Report 89. This study used ionizing radiation by inserting radioactive cobalt-60 using internal radiotherapy techniques, namely intracavitary brachytherapy. Before the irradiation process is carried out, there is a planning stage or Treatment Planning System (TPS). The reference for this research standard is for HRCTV of 95% -107% and for OAR bladder ≤80% rectum ≤75%. The average percentage of dose distribution received by HRCTV was 104.2% which is equivalent to 7.2 Gy which is still within the range of 95%- 107%, in the bladder it was 69.4% which is equivalent to 5.Gy which is still below the value ≤80%, and in the rectum it was 57% which is equivalent to 4.1 Gy which is still below the value ≤75%. The dose distribution value in HRCTV and OAR was still within the tolerance limit listed in the recommended value in GEC-ESTRO-ABS, and ICRU Report 89.
DETERMINATION OF HALF AND TENTH VALUE LAYER PRIMARY AND SECONDARY WALLS OF X-RAY ROOM IN BALI JIMBARAN GENERAL HOSPITAL Widianingsih, Ni Kadek Indah; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Sandi, I Nengah; Baskoro, Winardi Tjahyo; Wendri, Nyoman; Prayuda, I Made Ardi
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.250

Abstract

The research has been carried out on the HVL and TVL values ​​of the primary and secondary walls of the radiology installation radiology room at RSU Bali Jimbaran. The aims of this study were (1) to determine HVL and TVL values ​​on the primary and secondary walls in the x-ray room, (2) to determine the differences between HVL and TVL values ​​if the tube voltages are varied. In determining the HVL and TVL values, ​​the linear attenuation coefficient of the walls must be known. The linear attenuation coefficient was determined by measuring the wall thickness by using a caliper, and measuring the radiation dose rate before and after passing through the primary and secondary walls. The results of the analysis of the HVL and TVL values ​​on the primary wall were 1.668 cm and 5.540 cm, meanwhile on the secondary wall ​​were 1.915 cm and 6.362 cm. When the voltage was varied 40 kV, 50 kV, 60 kV and 70 kV, there was no difference in the HVL or TVL values. Based on the results of the analysis, the HVL and TVL values ​​on the primary and secondary walls have a significant average difference.
ESTIMATION OF RADIATION DOSE AND ORGANS AT RISK (OAR) ON ABDOMINAL CT-SCAN USING SIZE-SPECIFIC DOSE ESTIMATES (SSDE) METHOD Sari, Kamelin Diah; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Sandi, I Nengah; Artawan, I Nengah; Trisnawati, Ni Luh Putu; Widiana, I Komang
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.265

Abstract

A study has been carried out on the estimation of radiation dose and Organs at Risk (OAR) on abdominal CT-Scan examination using the SSDE method. The data used in this study were secondary data from medical records such as CTDIVol, DLP, and abdominal images of patients. This study aims to determine the size of SSDE, DE, and DEOAR and to determine whether DE is still within tolerance limits to ensure the feasibility of using CT-Scans in these installations. The SSDE value is obtained by multiplying the converted def value (f) and the CTDIVol, while the DE value is obtained by multiplying the DLP value and the conversion factor (k), finally, the DEOAR value is obtained by multiplying the CTDIVol and the organ/tissue weight factor. The results showed that the patient's average SSDE score was 12.04 ± 1.06 mGy, with a male SSDE value of 12.55 ± 1.30 mGy and a female SSDE value of 12.38 ± 2.47. While the average patient DEOAR value obtained was 7.57 ± 0.72 mGy and the patient's average DEOAR value for skin and bone surface was 0.09 ± 0.01 and red bone marrow and large intestine was 1.06 ±0.13. The DE value of this study is still below the tolerance value set by BAPETEN, which is less than 17.46 mGy.
Pengaruh Variasi Suhu Sintering Terhadap Struktur Kristalin Hidroksiapatit Tulang Iga Sapi Murzid, Jihan Qothrunada; Suharta, Wayan Gede; Spardi, I Wayan; Suardana, Putu; Kasmawan, I Gde Antha; Artawan, I Nengah; Prajitno, Djoko Hadi
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.20840

Abstract

A study entitled " The Effect of Sintering Temperature Variations on the Crystalline Structure of Bovine Bone Hydroxyapatite" has been carried out. The aim of this research is to understand how the sintering temperature influences the hydroxyapatite lattice parameters and to understand how the sintering temperature influences the volume and density of hydroxyapatite. The synthesis process begins with a calcination at 300 °C for one hour, followed by a sintering process with varying temperatures, namely 600 °C, 700 °C and 800 °C for samples A, B and C, respectively. To determine the hydroxyapatite content in the samples, then characterization using XRD was carried out. XRD results analysis was carried out using match3 and Rietica software. Identification results using match3 software obtained the presence of hydroxyapatite compounds and impurity compounds in the form of (Calcium trimagnesium carbonate huntite, Fluorine, Magnesium Hydrogensulfate Hydrate, Sassolite, Zemannite). The volume fraction of hydroxyapatite obtained in this study ranged from 68.6 – 82.8%. The higher the sintering temperature, the greater the volume fraction of hydroxyapatite. The Refinement results show that the higher the sintering temperature, the smaller the value of the lattice parameters in the direction of the a and c axes. Variations in sintering temperature also affect the resulting unit cell volume and density. The higher the sintering temperature, the smaller the unit cell volume, conversely the greater the unit cell density value.
Pemetaan Tingkat Bahaya Gempabumi Berbasis Percepatan Getaran Tanah Maksimum Dan Intensitas Gempabumi Di Provinsi Bali Kelo, Febriyanti Jia; Yuliara, I Made; Setiawan, Yohanes Agus; Sukarasa, I Ketut; Kasmawan, I Gde Antha; Suardana, Putu
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.20925

Abstract

The Research has been carried out on the level of earthquake hazard in the Bali region based on maximum ground vibration acceleration (PGA) and earthquake intensity. The data that used in this research were obtained from the BMKG and USGS catalogs. The value of the earthquake hazard level is calculated using the appropriate PGA empirical equation through a correlation test of several empirical equations, namely the Katayama, Mc. Guire, Faccioli, Singh et al, Ambraseys, and Wang & Tao with BMKG observation data.. Based on the correlation test, the Katayama equation (1974) was obtained with the smallest error value of 0.52. The calculation results show that the maximum PGA value ranges from 154-1944 gal and the earthquake intensity ranges from VII to X on the MMI scale with the highest hazard level in the Karangasem, Buleleng, and parts of Jembrana districts.
Uji Posisi Sumur Bor Terhadap Akuifer Menggunakan Metode Audio Magnetotelluric (ADMT) Silalahi, Dio Carpry Gunawan; Simpen, I Nengah; Putra, I Ketut; Nurmalasari, Ni Putu Yuni; Suryatika, Ida Bagus Made; Kasmawan, I Gde Antha
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.21468

Abstract

Research has been carried out regarding the position test of the drilled well against the aquifer at the Jimbaran Unud Campus on May 12, 2023. The borehole test was carried out using the Audio Magnetotelluric (ADMT) method. To ensure that the water needs of all students at Udayana are met, it is necessary to conduct research on drilled wells at Udayana whether they are suitable for aquifer positions (groundwater). The purpose of this study was to determine the suitability of the position of the drilled well to the aquifer in the ground behind the UNUD Rectorate Building. Based on the interpretation of the results of the research conducted in this paper, the aquifer position sought on line 1 is at a distance of 0–9 m and 21–50 m at a depth of 100–200 m below the ground surface, while on line 2 it is at a distance of 7–50 m at a depth of 100–140 m. Because the position of the Udayana drilled well is at 22.2 m on line 1 and 26.7 m on line 2 with a depth of 74 m, the Udayana drilled well is not yet in the aquifer position sought in this study.
Co-Authors Adnyana, I Gusti Agung Putra Anandika Putra, I Made Raditya Artawan, I Nengah Baskoro, Winardi Tjahyo Cory Amelia Dali Sinaga, Ade Nisa Daniel Happy Putra Dedy Pratama, I Putu Djoko Hadi Prajitno Efrensiana Ana Melti Fahik, Gracia Paula Gusti Ngurah Sutapa Gusti Ngurah, Sutapa Hadi Apriandi I G. A. Widagda I Gusti Agung Ayu Ratnawati I Gusti Agung Ngurah Ari Kusuma Putra I Ketut Putra I Ketut putra, I Ketut I Made Satriya Wibawa I Made Yuliara I Nengah Sandi I Nengah Sandi I Nengah Simpen I NYOMAN WIJAYA I Putu Wahyu Pranata Kusuma Jaya I Wayan Supardi I. M. Yuliara I. M. Yuliara I.M. Yuliara Ida Ayu Dwi Giriantari Ida Bagus Made Suryatika Ida Bagus Made Suryatika Ida Bagus Putu Priastana Bawa Irhas, Rozi Kelo, Febriyanti Jia M. Zully Amrul Hadi Made Sumadiyasa Made Suryatika, Ida Bagus Mas Janudinata, Gde Ari Mberato, Anastasia Jessing Gamalita Murzid, Jihan Qothrunada N. L. P. Trisnawati Ni Kadek Nova Anggarani Ni Kadek Nova Anggarani Ni Luh Putu Trisnawati Ni Made Wedayani Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Putu Yuni Nurmalasari Nurmalasari, Ni Putu Yuni Nyoman Wendri Pranditayana, I Nyoman Prawistya Putra, I Made Gede Mas Prayuda, I Made Ardi Putra Adnyana, I Gusti Agung Rosvita Hilbrida Sulastri Rozi Irhas Sari, Kamelin Diah Satriya Wibawa, I Made Setiawan, Yohanes Agus Silalahi, Dio Carpry Gunawan Silalahi, Johanes J. Sismanto Spardi, I Wayan Suandayani, Ni Komang Tri Sukarasa, I Ketut Tri Jaya Maghuna, Komang Trisnawati, Ni Luh Putu Umi Hariyani Wayan Balik Sudarsana Wayan Gede Suharta Widagda, I Gusti Agung Widagda, I. G. A Widiana, I Komang Widianingsih, Ni Kadek Indah Winardi Tjahjo Baskoro Winardi Tjahyo Baskoro Windaryoto Windaryoto Winer Johan Bora Yuliara, I Made Yuliara, Made