Monte Carlo simulations of the secondary neutron ambient and effective dose equivalent rates from surface to suborbital altitudes and low Earth orbit

El-Jaby, Samy; Richardson, Richard B.

doi:10.1016/j.lssr.2015.05.001

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…Certain engineering programs can shield some of the seven factors mentioned above. [31][32][33] Nevertheless, radiation, thermal uctuations, and ultrahigh vacuum can still pose signicant challenges to PSCs. In the follow-up discussion, we will focus on radiation-induced damage and will not specically address temperature and vacuum.…”

Section: Inuences and Requirements Of The Space Environmentmentioning

confidence: 99%

Advancements in radiation resistance and reinforcement strategies of perovskite solar cells in space applications

Huan,

Zheng,

Wang

et al. 2024

J. Mater. Chem. A

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Section: Inuences and Requirements Of The Space Environmentmentioning

confidence: 99%

Advancements in radiation resistance and reinforcement strategies of perovskite solar cells in space applications

Huan,

Zheng,

Wang

et al. 2024

J. Mater. Chem. A

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“…Low-energy thermal neutrons comprise a notable fraction of these radiotherapy neutron fields [1]. Thermal neutrons have also been measured in CANada Deuterium Uranium (CANDU) reactor workplaces [4], in space [5,6], in highaltitude aircraft [7], and on the lunar surface [8]. Approximately 50% of thermal neutrons penetrate up to 2 cm into a tissue phantom, with a maximum range of over 10 cm [9].…”

Section: Introductionmentioning

confidence: 99%

High-Accuracy Relative Biological Effectiveness Values Following Low-Dose Thermal Neutron Exposures Support Bimodal Quality Factor Response with Neutron Energy

Paterson

Festarini

Stuart

et al. 2022

IJMS

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Theoretical evaluations indicate the radiation weighting factor for thermal neutrons differs from the current International Commission on Radiological Protection (ICRP) recommended value of 2.5, which has radiation protection implications for high-energy radiotherapy, inside spacecraft, on the lunar or Martian surface, and in nuclear reactor workplaces. We examined the relative biological effectiveness (RBE) of DNA damage generated by thermal neutrons compared to gamma radiation. Whole blood was irradiated by 64 meV thermal neutrons from the National Research Universal reactor. DNA damage and erroneous DNA double-strand break repair was evaluated by dicentric chromosome assay (DCA) and cytokinesis-block micronucleus (CBMN) assay with low doses ranging 6–85 mGy. Linear dose responses were observed. Significant DNA aberration clustering was found indicative of high ionizing density radiation. When the dose contribution of both the 14N(n,p)14C and 1H(n,γ)2H capture reactions were considered, the DCA and the CBMN assays generated similar maximum RBE values of 11.3 ± 1.6 and 9.0 ± 1.1, respectively. Consequently, thermal neutron RBE is approximately four times higher than the current ICRP radiation weighting factor value of 2.5. This lends support to bimodal peaks in the quality factor for RBE neutron energy response, underlining the importance of radiological protection against thermal neutron exposures.

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Corrigendum to “Monte Carlo simulations of the secondary neutron ambient and effective dose equivalent rates from surface to suborbital altitudes and low Earth orbit”

El-Jaby

2016

Life Sciences in Space Research

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A recent paper published in Life Sciences in Space Research (El-Jaby and Richardson, 2015) presented estimates of the secondary neutron ambient and effective dose equivalent rates, in air, from surface altitudes up to suborbital altitudes and low Earth orbit. These estimates were based on MCNPX (LANL, 2011) (Monte Carlo N-Particle eXtended) radiation transport simulations of galactic cosmic radiation passing through Earth's atmosphere. During a recent review of the input decks used for these simulations, a systematic error was discovered that is addressed here. After reassessment, the neutron ambient and effective dose equivalent rates estimated are found to be 10 to 15% different, though, the essence of the conclusions drawn remains unchanged.

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Monte Carlo simulations of the secondary neutron ambient and effective dose equivalent rates from surface to suborbital altitudes and low Earth orbit

Cited by 6 publications

References 13 publications

Advancements in radiation resistance and reinforcement strategies of perovskite solar cells in space applications

Advancements in radiation resistance and reinforcement strategies of perovskite solar cells in space applications

High-Accuracy Relative Biological Effectiveness Values Following Low-Dose Thermal Neutron Exposures Support Bimodal Quality Factor Response with Neutron Energy

Corrigendum to “Monte Carlo simulations of the secondary neutron ambient and effective dose equivalent rates from surface to suborbital altitudes and low Earth orbit”

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