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Scattered Radiation Dose Calculation in the Multi-Bay Resuscitation Room using MCNP5 Code

Marianie Musarudin, Ruzainah Mohd Nordin and Nik Kamarullah Ya Ali

Pertanika Journal of Tropical Agricultural Science, Volume 27, Issue 4, October 2019

Keywords: MCNP5, scattered dose, x-ray room

Published on: 21 October 2019

This study aims to characterise the scattered dose distribution from a ceiling-mounted X-ray unit in a multi-bay resuscitation room. The finding of this study is essential for optimisation and safety of staff and patients. Simulation of phantom imaging was carried out using MCNP5 code. The calculated data were initially compared against the measurements carried out using a survey meter. Three measurement positions, denoted by T2, T3, and T4 were considered for the dose calculation. The data suggested that T2 received the highest scattered dose. This value (maximum value of less than 6 µGy) is lower than the annual dose limit for the public and radiation workers as well as natural background radiation dose. Meanwhile, T3 consistently received a higher scattered dose (maximum difference of 25.62%) than T4. The angles of the X-ray tube resulted in scattered doses less than 6 µGy for both 90° and 100° scattering angles. In conclusion, the scattered dose for a single exposure imaging inside the room is safe. Yet, consideration of the placement of a portable lead shielding between X-ray tube and treatment couch is strongly recommended. This is due to a high number of imaging procedures commonly performed daily in a busy hospital. Hence, the cumulative dose to the paramedic staff and patients may exceed the safe level.

ISSN 1511-3701

e-ISSN 2231-8542

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