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Effect of High Photon Energy Spectra on Induced-Photo- Neutron Dosimetry using NTDs |
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PP: 43-46 |
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doi:10.18576/jrna/050106
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Author(s) |
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E. H. Ghanim,
N. E. Khaled,
A. R. El-Sersy,
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Abstract |
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| In the current study, the induced-photo-neutrons resulting from high energy x-ray photons of medical linear accelerator were measured by CR-39 nuclear track detectors (NTDs). Also, the converter (BN1) of active thin layer of 40 μm in thickness of natural boron was used. It was manufactured by coated natural boron on polyester substrate of about 100 μm in thick. The converter (BN1) screen slide films were used in order to measure the thermal neutron dose through the (n-α) reaction. Moreover, CR-39 NTDs was designed to measure both fast neutron doses through the (n-p), in exposing directly, and thermal neutron doses with converter, respectively. High Photons energy spectra from Elekta medical linear accelerator of 18 MV were used. Results of this work achieved that the measurements of thermal neutron dose relatively smaller than that of the fast neutron dose in case of direct exposure. On the other hand, the ratio of fast to that of thermal is less than that of direct exposure in the case of measurements on phantom and upon the use of build-up Perspex sheets. The validity of using NTDs in the field of photo-neutron detections was carried out and the evaluation of radioecology was concerned |
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