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PENGUKURAN SPEKTRUM NEUTRON PADA TABUNG BERKAS NEUTRON RADIOGRAFI REAKTOR G.A. SIWABESSY DENGAN SINGLE SPHERE SPECTROMETER Rasito Tursinah; Bunawas Bunawas; U. Tarmulah; S. Zanuar; D. Andrega
GANENDRA Majalah IPTEK Nuklir Volume 21 Nomor 2 Juli 2018
Publisher : Website

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.581 KB) | DOI: 10.17146/gnd.2018.21.2.4316

Abstract

Telah dilakukan pengukuran spektrum neutron pada tabung berkas neutron fasilitas radiografi neutron reaktor G.A Siwabessy. Pengukuran dilakukan untuk mengkonfirmasi adanya faktor penyebab menurunnya kualitas ketajaman citra hasil dari radiografi. Pengukuran spektrum neutron dilakukan menggunakan single sphere spectrometer (SSS) dengan tujuh detektor keping emas. Tampilan spektrum neutron dari konversi aktivitas detektor SSS dilakukan menggunakan software UMG 3.3, adapun fungsi respon detektor SSS dihitung menggunakan software MCNPX. Berdasarkan hasil pengukuran diperoleh spektum neutron didominasi termal dengan fluks termal 6,14×106 neutron cm-2s-1, epitermal 1,18×106 neutron cm-2s-1, dan neutron cepat 3,37×106 neutron cm-2s-1. Hasil pengukuran spektrum tersebut mengkonfirmasi bahwa terjadi penurunan fluks neutron termal di ujung tabung berkas neutron radiografi (dari 9,2×106 neutron cm-2s-1), sehingga hal ini bisa menjadi salah satu sebab penurunan kualitas ketajaman citra radiografi.
Sertifikasi Ulang Kamera Radiografi Gamma Industri Jenis Portabel B.Y. Eko Budi Jumpeno; Bunawas Bunawas
Widyanuklida Widyanuklida, Volume 13 Nomor 1, November 2013
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4995.456 KB)

Abstract

ABSTRAK Telah diuraikan metode pengujian pada sertifikasi ulang kamera radiografi gamma industri tipe portabel. Sertifikasi ulang tersebut mencakup 3 pengujian yaitu pengukuran laju dosis ekivalen ambien, uji kebocoran sumber radioaktif, serta uji visual dan ketahanan proyeksi peralatan radiografi gamma industri. Pengujian mengacu pada standar yang tercantum dalam SNI ISO 3999:2008, SNI 18-6650.2-2002, dan ketentuan keselamatan yang ditetapkan dalam Perka BAPETEN No. 7 Tahun 2009. Laporan/sertifikat pengujian yang diterbitkan digunakan sebagai bahan pertimbangan BAPETEN dalam menerbitkan izin pemanfaatan radiografi industri. Para pemangku kepentingan yang meliputi BAPETEN, dunia industri radiografi, dan lembaga penguji harus duduk bersama untuk merumuskan protokol sertifikasi ulang dan menetapkan waktu berlakunya protokol tersebut. Apabila protokol tersebut disepakati oleh para pemangku kepentingan maka persyaratan keselamatan sebagaimana dinyatakan dalam Perka BAPETEN No. 7 Tahun 2009 dapat dipenuhi tanpa mengabaikan sisi ekonomi dalam pemanfaatan radiografi gamma industri. Komitmen bersama para pemangku kepentingan berdasarkan protokol yang disepakati merupakan suatu persyaratan utama dalam pelaksanaan sertifikasi ulang kamera radiografi gamma industri, ketika aspek teknis pengujian sudah siap diimplementasikan.   ABSTRACT Testing method already described in recertification of industrial gamma radiography camera type portable. The recertification includes 3 (three) testing, namely the ambient equivalent dose rate measurement, leak test of radioactive sources, and visual and endurance test of projected industrial gamma radiography equipment. The testing refers to the standard set forth in ISO 3999:2008, ISO 18-6650.2-2002, and safety provisions set out in the BAPETEN Chairman Regulation No. 7:2009. Test reporticertificate issued in the recertification program is used as a material consideration in issuing permits utilization BAP ETEN industrial radiography. Stakeholders in the recertification of program industrial gamma radiography camera type portable which includes BAP ETEN, community of industrial radiography, and independent testing body should discuss together to formulate protocols recertification and set the time of entry into force of the protocols. If recertification protocols of industrial gamma radiography camera was agreed by the stakeholder, so safety requirements as stated in the BAPETEN Chairman Regulation No. 7:2009 can be met without compromising the economic factor in the utilization of industrial gamma radiography. Commitment with stakeholders based on agreed-upon protocol is a key requirement in the implementation of recertification industrial gamma radiography camera, when the technical aspects oj the test is ready to be implemented.  
Determination of Neutron Spectrum at LINAC Using a Passive Single Sphere Spectrometer Muhammad Helmi Hakim; Chomsin Sulistya Widodo; Bunawas Bunawas; Rasito Rasito
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (390.352 KB) | DOI: 10.21776/ub.natural-b.2016.003.04.7

Abstract

Neutron spectra at Linear Acceleration (LINAC) facility was needed to protect neutron radiation. The purpose of determination of neutron spectra at LINAC using Passive Single Sphere Spectrometer is getting spectra and neutron fluence from LINAC and knowing the influence of input voltage at LINAC to its spectra and neutron fluence output. Single Sphere Spectrometer (SSS) with diameters 30 cm using seven gold foil detectors was set in position a half of diameter (0, 3, 6, 9, 11, 12, 13 cm) from center of the SSS. Measurement of neutron count rate was performed by placing SSS under gantry of LINAC with SSD 100 cm in distances. Next, neutron count rate was used as input data in UMG 3.3 program to get spectra. Based on measurement, total of neutron fluence at LINAC 10 MV and 15 MV is 5,78 ´ 104 n/cm2.s ± 0,01 ´ 104and 9,44 ´ 105 n/cm2.s ± 0,22 ´ 105, so increasing input voltage at LINAC was followed by increased neutron fluence.