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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Teknologi Reaktor Nuklir Tri Dasa Mega Natural B Journal Of Vocational Health Studies
Risalatul Latifah
Department Of Physics, Faculty Of Mathematics And Natural Science, Universitas Brawijaya, Malang-Indonesia
Astronomy Earth & Planetary Sciences Education Energy Environmental Science Health Professions Materials Science & Nanotechnology Physics

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TEKNIK AKTIVASI FOIL INDIUM UNTUK MENENTUKAN DISTRIBUSI NEUTRON TERMAL DALAM FANTOM PADAT DI BAWAH IRADIASI LINAC 15MV Risalatul Latifah; Johan A.E. Noor; Bunawas Bunawas
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 15, No 2 (2013): Juni 2013
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (547.087 KB)

Abstract

Dewasa ini, penggunaan pesawat linear accelerator (linac) untuk kegiatan terapi pada penyakit kanker mulai intensif digunakan.Keuntungan utama linac dibanding dengan pesawat teleterapi adalah tidak lagi menggunakan sumber radioaktif serta memiliki variasi energi sehingga bisa disesuaikan dengan kebutuhan. Ketika sebuah pesawat linac dioperasikan di atas 10 MV, maka akan terjadi reaksi fotoneutron (γ,n) hasil dari interaksi energi sinar-X tinggi yang menumbuk material-material penyusun komponen pesawat linac seperti target, kolimator dan filter. Reaksi fotoneutron ini akan menghasilkan neutron. Pengukuran fluks neutron sangat penting untuk dilakukan terkait dengan keselamatan pada tindakan radioterapi dikarenakan emisi neutron ini merupakan radiasi sekunder yang akan menaikkan resiko kanker sekunder pada pasien akibat bertambahnya dosis radiasi yang diterima. Studi ini mengevaluasi fluks neutron yang dihasilkan oleh pesawat linac 15 MV menggunakan teknik aktivasi foil. Sebanyak 45 foil disisipkan dalam fantom padat yang diradiasi oleh linac untuk mengetahui besarnya fluks neutron terhadap fungsi kedalaman.Nilai yang didapat dimaksudkan untuk mengestimasi dosis tambahan untuk pasien ketika menjalani treatment menggunakan linac pada operasi di atas 10 MV. Dengan menggunakan hasil analisa spektrometer gamma dari foil indium yang teraktivasi, nilai fluks mengalami kenaikan seiring dengan bertambahnya kedalaman sampai pada 7 cm di bawah permukaan dengan nilai 2,6 x 106 ncm-2s-1 kemudian terus menurun seiring bertambahnya jarak. Pola ini terjadi karena adanya proses termalisasi neutron. Dengan menggunakan metode faktor konversi dosis neutron termal, maka diketahui dosis tambahan dari fluks neutron maksimum yang diterima pasien adalah 0,86 mSv/menit. Kontribusi dosis ini relatif kecil yaitu sebesar 0,1% dari dosis terapi.Kata kunci: Fluks neutron termal, LINAC, indium, fantom, aktivasi foil. Nowadays, using linear accelerator (LINAC) for therapeutic cancer activity intensively use. The advantages of linac compared to teletherapy plane are no longer using radioactive sources and have a variety of energy thus can be adapted to the needs . When a linac is operated above 10 MV , there will be a photoneutron reaction (γ,n) from the interaction of high X-rays energy striking the material components of linac such as target , collimator and filter. Photoneutron reaction will produce neutrons. Measurement of neutron flux is very important to the safety in the radiotherapy due to neutron emission is a secondary radiation that would increase the risk of secondary cancers in patients due to increasing the dose of radiation received . This study evaluated the neutron flux generated by the 15 MV linac using foil activation technique. The 45 foils inserted in a solid phantom irradiated by the linac to determine the neutron flux on the function of depth. This value will be used to estimate the additional dose to the patient while undergoing treatment using the linac operating above 10 MV. By using a gamma spectrometer analysis of the activated indium foil, flux values increase by adding depth of up to 7 cm below the surface with a value of 2.6 x 106 ncm-2s-1 and it would be decrease by increasing depth. This pattern occurs because the neutron thermalization process. By using the method of thermal neutron dose conversion factor, additional dose for maximum neutron flux that received by patients was 0.86 mSv/min. This dose contribution is relatively small, it is only 0.1 % of the therapeutic dose. Keywords: Thermal neutron flux, LINAC, indium, phantom, activation foil.
Insecticide Effects on Membrane Potential of Catfish Egg Cell (Clarias batrachus) Unggul Punjung Juswono; Kusharto Kusharto; Yeni Cahyati; Risalatul Latifah
Natural B, Journal of Health and Environmental Sciences Vol 1, No 3 (2012)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.853 KB) | DOI: 10.21776/ub.natural-b.2012.001.03.9

Abstract

Pollution has been occured in our environment due to daily life waste, industrial and using of peptiside in agroindustrial farm. Over usuage and dose of peptiside could be harmfull to the farm environment especially for fish farm. Measurement of membrane potential of fish egg cells is a simple metode to investigate water polution level. Membrane potential of fish egg cells can be measured using microelectrode probe which is connected to an electrometer. The changing of membrane potential value indicate the level of water polution. Variation of peptiside concentrations cause the changing of potential membrane value. Increasing of peptiside concentration cause decreasing of potential membrane. Its may due to some blocking of channel and other protein by peptiside molecule so the permeability of membrane to ions is decrease. The results of our experiment show that the increasing of peptiside concentration cause decreasing of the membrane potential value. For peptiside concentration of  0.4% decrease potential membrane to -28 ± 5 mV. It means that the increasing peptiside concentration cause significanly decrease in potential membrane which may be used for prediction of water polution level.
Thermal Neutron Flux Measurements at Room Treatment LINAC iX 15 MV Risalatul Latifah; Johan A E Noor; Bunawas Bunawas
Natural B, Journal of Health and Environmental Sciences Vol 2, No 2 (2013)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1418.117 KB) | DOI: 10.21776/ub.natural-b.2013.002.02.14

Abstract

Linac is operated at above 10 MV will generate secondary radiation in the form of neutron emission from the reaction of the high photon energy linac striking the material components of linac such us targets, collimators and filters. Secondary radiation will increase the probability of the secondary cancer risk in patients due to increasing the dose of radiation received. This study evaluated the thermal neutron flux at the indoor spatial operated 15 MV linac using foil activation method. A total of 14 Indium-115 foil placed in the treatment room were exposed to 15 MV linac plane for 1 minute. Results showed the highest flux are around isocenter . With the flux value of additional dose due to the neutron flux at Sv/menit. FLux decreases as distance function. Related to radiation protection efforts for radiation workers, the contribution coming from the neutron dose necessary acted upon by adding shielding on the door.
ESTIMATION OF ENTRANCE SURFACE DOSE (ESD) AS A DOSE PROFILE FOR PATIENTS UNDERGOING RADIOGRAPHY EXAMINATION BASED ON TUBE OUTPUT MEASUREMENT Risalatul Latifah; Muhammad Rosyid; Firdy Yuana; Achmad Hidayat
Journal of Vocational Health Studies Vol. 4 No. 2 (2020): November 2020 | JOURNAL OF VOCATIONAL HEALTH STUDIES
Publisher : Faculty of Vocational Studies, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jvhs.V4.I2.2020.72-77

Abstract

Background: Radiography examinations are the most widely used and indispensable tools in medical imaging. The dose received by the patient should be known to prevent the risk of radiation exposure. Patient dose in radiography examination can be best estimated in terms of entrance surface dose (ESD). ESD value can be obtained by using the recorded dose viewer installed on the device. However,  not all devices have this feature. Other methods can be conducted using thermoluminescence dosimeter (TLD) although it practically requires a high cost. Purpose: The study aims to estimate the ESD as a dose profile for patients undergoing radiography examination using tube output. Method: The patient data and exposure factors were retrospectively recorded for 263 patients. The ESD was estimated from the measurements of the X-ray tube output and recorded exposure factors.  Results: The ESD value varied from 0.002 to 0.41 mGy. In the thorax PA, thorax LAT, cervical LAT, cervical AP, skull AP, skull LAT, genu LAT and waters was found (0,23±0.05) mGy, (0,09±0,05) mGy, (0,07±0,04) mGy, (0,13±0,08) mGy, (0,03±0,01) mGy, (0,06±0,02) mGy, (0,04±0,00) mGy (0,04±0,02) mGy, respectively. These results were further used to determine the Local Diagnostic Reference Level (LDRL) value. Conclusion:  The results revealed that LDRL fell below the national DRL value and international reference
Estimation of the k-Value for Head CT Using ICRP-103 Tissue Weighting Factors Johan Andoyo Effendi Noor; Risalatul Latifah; Firdy Yuana
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 11 No. 2 (2021)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v11n2.p179-188

Abstract

Multi-slice x-ray CT scanners are in highly use by physicians to assist them in diagnosing patients disease due to advances in their scanning speed, image processing and image quality. However, this trend results in patients being exposed to many fold higher doses compared to those for general x-ray radiography. This makes CT machines the major source of unwanted dose to the population from medical x-ray procedures. The CTDIvol and DLP parameters are quantities of concern in radiation protection measures. This study was aimed to examine the effective dose received by patients underwent head CT procedures In this paper we present our estimation of the k-value calculated from the DLP from the CT machine in the participating hospital using the ICRP 103 weighted tissue factor. Dose parameters were acquired from the machine and calculations were carried out using the ImPACT CTDosimetry software. We also compared the received doses by age and gender groups. We found that the doses are dissimilar between age groups and between male and female patients.
Co-Authors Achmad Hidayat Bunawas Bunawas Bunawas Bunawas Firdy Yuana Johan A E Noor Johan A.E. Noor Johan Andoyo Effendi Noor Kusharto Kusharto Muhammad Rosyid Unggul Punjung Juswono Yeni Cahyati