Open Access
CC BY 4.0 · World J Nucl Med 2023; 22(02): 152-170
DOI: 10.1055/s-0043-1769957
Presentation Abstracts

Evaluate the Slab Thickness of the New LINAC Bunker as Shielding at the INMP, AERE, BAEC, Bangladesh

Md. Masud Parvej
1   Bangladesh Atomic Energy Commission, Bangladesh
,
Gono Bishwabidyalay
1   Bangladesh Atomic Energy Commission, Bangladesh
,
Nahida Sultana
1   Bangladesh Atomic Energy Commission, Bangladesh
,
Abdur Rahim
1   Bangladesh Atomic Energy Commission, Bangladesh
,
Sarmin Sultana
1   Bangladesh Atomic Energy Commission, Bangladesh
,
Abul Hasnat
1   Bangladesh Atomic Energy Commission, Bangladesh
,
M. Monjur Ahasan
1   Bangladesh Atomic Energy Commission, Bangladesh
› Author Affiliations
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    parvej.baec@gmail.com

    Introduction: Radiation shielding is crucial in the design of a linear accelerator (LINAC) bunker. The thickness of the concrete slab used for shielding purposes is an essential factor in reducing the radiation dose to acceptable levels. In the Institute of Nuclear Medical Physics (INMP), Savar, Dhaka, there is a plan to install second clinical LINAC whose bunker is now under construction under the ground. In this study, we evaluate the slab thickness of the new LINAC bunker to determine if it provides adequate radiation shielding.

    Methods: The LINAC will use a maximum energy photon beam of 18 MV. The internal height of the bunker is 610 cm and the distance from the iso-center to the slab is 480 cm. The slab is constructed with concrete (2.35 g/cm3) as the shielding material. To calculate the required shielding thickness, we used a theoretical shielding calculation model, we assumed that the LINAC will treat a maximum of 50 patients per week, with an equal distribution of 6 MV and 18 MV photon energies and 3DCRT and IMRT treatment techniques. Based on NCRP-151 and Safety Series 47, we set the occupancy factor (T) to 1, the use factor (U) to 0.263 for the gantry angles of 0°/180°, and the dose limit factor (P) to 5 mSv/y. Finally, we calculated the shielding thickness of the slab according to all factors.

    Results: According to our theoretical model, the required shielding thickness for the LINAC bunker is 231.59 cm. However, the slab thickness currently under construction is 304 cm, which is more than sufficient to provide the necessary shielding.

    Conclusion: Our study confirms that the thickness of the slab for the new LINAC bunker at the INMP provides adequate radiation shielding for the proposed treatment workload. These findings can contribute to the safer delivery of radiation therapy for patients and personnel. There are further options to study to evaluate all surrounding walls of the new bunker.


     

    No conflict of interest has been declared by the author(s).

    Publication History

    Article published online:
    25 May 2023

    © 2023. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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