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 ´ 10 4 n/cm 2 .s ± 0,01 ´ 10 4 and 9,44 ´ 10 5 n/cm 2 .s ± 0,22 ´ 10 5 , so increasing input voltage at LINAC was followed by increased neutron fluence.
Highlights
Neutron merupakan partikel penyusun inti atom yang tidak mempunyai muatan listrik, karena tidak memiliki muatan listrik maka gerak neutron tidak dipengaruhi oleh medan
seven gold foil detectors was set in position a half of diameter
Measurement of neutron count rate was performed by placing Single Sphere Spectrometer (SSS) under gantry
Summary
Neutron merupakan partikel penyusun inti atom yang tidak mempunyai muatan listrik, karena tidak memiliki muatan listrik maka gerak neutron tidak dipengaruhi oleh medan. Teknik aktivasi neutron dengan menggunakan detektor aktivasi berbentuk keping dapat digunakan untuk menentukan spektrum energi neutron yang disebabkan dari paparan neutron terhadap beberapa keping, dengan memperhatikan kesesuaian reaksi dalam rentang batas energi yang dimiliki material keping tersebut [6]. Metode Passive Single Sphere Spectrometer digunakan dengan detektor keping aktivasi dalam menentukan spektrum neutron di LINAC karena merupakan jenis metode pengukuran tidak langsung sehingga tingkat keamanan terhadap radiasi lebih baik jika dibandingkan dengan pengukuran menggunakan metode aktif.
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