Design by Monte Carlo method of a thermal neutron device using a 241Am/9Be source and high-density polyethylene moderator

Cevallos-Robalino, Lenin E.; García-Fernández, Gonzalo F.; Lorente, Alfredo; Gallego, Eduardo; Vega‐Carrillo, Héctor René; Guzmán-García, Karen Arlete

doi:10.1016/j.apradiso.2019.05.040

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…While concrete and lead are typical shielding materials, polyethylene and water are known moderators of neutrons, which can be used for machine calibration for radiation dosimetry and radiation protection. The use of water phantoms is a golden standard for calibrating LINAC machines for they are well-known as tissue-equivalent materials (Vega-Carillo et al, 2010;Cevallos-Robalino et al, 2019;Qi et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Computational Investigation of Neutron Field modified with Various Materials

Astronomo,

Inocencio,

Dingle

et al. 2022

MJST

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Medical accelerators, such as cyclotrons for Positron Emission Tomography (PET) and linear accelerators (LINAC), generate neutrons as a byproduct during operation. Neutron fields in these facilities tend to vary depending on the facility design as well as the presence of various materials in the facility. Unfortunately, these variations in the neutron field cannot be accounted for by neutron survey meters that are typically deployed in the workplace for radiation monitoring. In this work, the researchers used Monte-Carlo-N-Particle (MCNP) 6.1 to investigate the extent of field modification with materials that are commonly found in accelerator facilities. A computational investigation was performed using the field of the 252Cf source in the Philippine Nuclear Research Institute Neutron Laboratory (PNL) that was modified using polyethylene, lead, concrete and water. Variations in the spatial and energy distribution of neutron fluence as a result of introducing each modifier were presented. It was found that the relative deviation in the neutron dose due to polyethylene, lead, concrete and water modifiers were 96, 47, 83 and 94%, respectively. The result of this work was used as a basis for experiments performed at the PNL to investigate the limitations of commercial neutron survey meters when conducting dose measurements in different neutron fields.

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Section: Methodsmentioning

confidence: 99%