Analysis of photoneutron spectra produced in medical accelerators

Ongaro, C.; Zanini, A.; Nastasi, U.; Ródenas, J.; Ottaviano, Giuseppe; Manfredotti, C.

doi:10.1088/0031-9155/45/12/101

Cited by 88 publications

(43 citation statements)

References 5 publications

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“…The mean neutron energy ranges between 700 keV and 1 MeV. 18 The dominant energy peak centred around 1 MeV is due to evaporation mechanism, in which the neutron angular emission is isotropic, and the energy distribution follows the Maxwellian curve. Moreover a peak can be observed for energies higher than 3 MeV due to direct-reaction neutron knockout component: in this case the angular distribution is anisotropic, f(Â) = a + b(sin Â) 2 , and the energy distribution is given by the difference between the photon energy and the binding energy,…”

Section: Resultsmentioning

confidence: 99%

Radiotherapy dose enhancement using BNCT in conventional LINACs high-energy treatment: Simulation and experiment

Alikaniotis

Borla

Monti

et al. 2016

Reports of Practical Oncology & Radiotherapy

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Section: Resultsmentioning

confidence: 99%

Radiotherapy dose enhancement using BNCT in conventional LINACs high-energy treatment: Simulation and experiment

Alikaniotis

Borla

Monti

et al. 2016

Reports of Practical Oncology & Radiotherapy

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“…Apabila pesawat LINAC dioperasikan pada energi di atas 8 MV, maka akan dihasilkan neutron dari reaksi fotoneutron (γ,n) sebagai hasil dari interaksi energi tinggi sinar-X dengan bahan komponen kepala LINAC seperti pada bagian kolimator, target, dan foil hamburan [3].…”

Section: Data Yang Dipublikasikan Oleh Aapm (The American Associationunclassified

Estimation of Effective Dose Out of Fields in LINAC Radiotherapy Variant iX for Cervical Cancer

Listuayu

Noor

Bunawas

2016

Nat-B

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ABSTRAKPesawat LINAC yang dioperasikan pada energi di atas 8 MV dapat menghasilkan emisi fotoneutron yang ditimbulkan dari interaksi antara energi foton tinggi yang menumbuk material penyusun linac di antaranya kolimator, target dan foil hamburan. Radiasi sekunder yang terjadi ini dapat meningkatkan risiko kanker sekunder dan tambahan dosis radiasi yang diterima selain dosis foton. Studi ini mengestimasi out of field dose di sekitar kanker serviks berupa dosis efektif neutron dan foton. Estimasi dilakukan dengan menggunakan pasangan detektor termoluminesensi (TLD), yaitu TLD 600 dan TLD 700. TLD dikalibrasi dengan menggunakan sumber 60 Co dan sumber 252 Cf. Penyinaran LINAC dengan dosis 2 Gy yang dilakukan sebanyak tiga kali menghasilkan dosis efektif neutron rata-rata yang diterima organ-organ sehat dekat target berkisar dari 0,3 mSv sampai 4,8 mSv Sedangkan untuk dosis efektif foton rata-rata yang diterima oleh pasien (fantom) berada pada kisaran 42,9 mSv sampai 920,1 mSv. Dosis efektif neutron dan foton yang diterima semakin kecil jika letaknya semakin jauh dari titik isocentre. Kata kunci: LINAC, Kanker serviks, Out of Field, TLD.ABSTRACT LINAC operated at energies above 8 MV can result in photoneutron emissions arising from the interaction between high-energy photons striking the constituent materials such as collimator, the target and the scattering foil. This secondary radiation may increase the risk of secondary cancers and additional radiation dose received in addition to dose of photons. This study estimates the dose out of the field around cervix cancer in the form of an effective dose of neutron and photon. Measurements were carried out using termoluminescence (TLD) detector pairs, TLD 600 and TLD TLD 700. Neutron dose distribution was determined by placing the TLD pairs at 8 points scattered in the phantom.. LINAC irradiations at a dose of 2 Gy were conducted three times that produced effective dose neutron range from 0.3 mSv to 4.8 mSv. While the effective dose photon as read by the TLDs range from 42.9 to 920.1 mSv.The effective dose of neutron and photon received were less for points located further away from the point of isocentre. Keywords: LINAC, Cervix Cancer, Out of Field, TLD PENDAHULUANData yang dipublikasikan oleh AAPM (The American Association of Physicists in Medicine) pada tahun 2010 sampai saat ini kanker serviks masih merupakan masalah kesehatan wanita dengan angka kejadian dan angka kematian yang tinggi, di mana hampir setiap harinya ditemukan 41 kasus baru dan 20 kasus kematian [1]. Salah satu metode pengobatan dari penyakit kanker serviks adalah dengan radioterapi menggunakan pesawat LINAC. Akhir-akhir ini, pesawat LINAC semakin intensif digunakan untuk terapi kanker. Kanker serviks sendiri merupakan salah satu jenis kanker yang sering diradiasi dengan menggunakan pesawat LINAC energi tinggi di atas 10 MV [2]. Hal ini disebabkan letak kanker

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“…Works like of the [23] established minimal differences in using of simplified geometries and complete for calculating photoneutrons. This has led most authors to use simplified geometries in their calculations [32]; [20]; [7]; [42]; [34]; [3]; [28]. Taking advantage that we have the complete geometry of the accelerator Varian Clinac 2100 C/D, we have studied the influence of the shielding cover in this study.…”

Section: Description Of Linacsmentioning

confidence: 99%

Neutron Dose Equivalent in Tissue Due to Linacs of Clinical Use

Ovalle¹

2013

Frontiers in Radiation Oncology

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Analysis of photoneutron spectra produced in medical accelerators

Cited by 88 publications

References 5 publications

Radiotherapy dose enhancement using BNCT in conventional LINACs high-energy treatment: Simulation and experiment

Radiotherapy dose enhancement using BNCT in conventional LINACs high-energy treatment: Simulation and experiment

Estimation of Effective Dose Out of Fields in LINAC Radiotherapy Variant iX for Cervical Cancer

Neutron Dose Equivalent in Tissue Due to Linacs of Clinical Use

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