A Benchmark for Galactic Cosmic-Ray Transport Codes

Wilson, John W.; Townsend, Lawrence W.

doi:10.2307/3577217

Cited by 12 publications

(2 citation statements)

References 7 publications

(6 reference statements)

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“…Most existing studies on neutron radiation focus on their carcinogenic risks and are primarily based on experiments with exposures to neutron energies below 20 MeV, while simulation and dosimetry studies illustrate that neutron energies in space environment go up to much higher energies [58]. In addition, measurements on the Martian surface show that neutrons will be a significant contributor to measured absorbed dose and it is estimated that they contribute ∼15% toward the intravehicular dose to astronauts [57,58,72]. Though the immune impact of neutron irradiation is poorly studied, a gene expression study by Broustas et al illustrated a clear suppression of immune cell function after 1 Gy neutron irradiation and downregulation of genes that were related to the immune system response and B and T cell physiology [73].…”

Section: Discussionmentioning

confidence: 99%

Immunological Changes During Space Travel: A Ground-Based Evaluation of the Impact of Neutron Dose Rate on Plasma Cytokine Levels in Human Whole Blood Cultures

et al. 2020

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A better understanding of the combined impact of different space stressors on human health is urgently warranted, considering the upcoming long-duration missions beyond lower Earth orbit. Therefore, a growing number of particle accelerator facilities implement ground-based set-ups to study the effect of simulated space radiation with simulated psychological or physical stressors. The immune system is highly sensitive to these types of stressors and limited information is currently available on the impact of the complex space radiation environment on the astronauts' immune function. This pilot study presents a first step in the implementation of a ground-based set-up with neutron irradiation, which is considered to be an important secondary component in space radiation fields. The effect of dose rate on immune alterations was studied using the in vitro cytokine release assay. Whole blood samples (n = 8) were exposed to 0.125 or 1 Gy of neutron irradiation (fluence-weighted average energy: 29.8 MeV) at a lower dose rate (LDR) of 0.015 Gy/min and a higher dose rate (HDR) of 0.400 Gy/min. Immediately post-irradiation, blood samples were stimulated with lipopolysaccharide (LPS), heat-killed Listeria monocytogenes (HKLM) or lectin pokeweed mitogen (PWM), and incubated for 24 h. Cell-mediated immunity was examined by analysing interleukin-2 (IL-2), interferon-gamma (IFN-γ), tumour necrosis factor-alpha (TNF-α), and interleukin-10 (IL-10) plasma levels. Stimulants significantly increased all cytokine levels except IL-2, where only PWM induced a significant increase. In general, no statistically significant changes were observed in IL-2, IFN-γ, and TNF-α concentrations at different neutron doses and dose rates when compared to their stimulated, sham-irradiated controls. After PWM-stimulation, IL-10 levels were significantly increased at 0.125 Gy HDR and 1 Gy LDR. In a pooled analysis, the HDR significantly increased IL-2 titres (under PWM-stimulation) and IFN-γ titres (with all stimulants), but significantly decreased TNF-α secretion in unstimulated cultures. Due to the limited sample number, no strong conclusions could be made in this pilot study on the effect of neutron radiation as a single stressor on cytokine secretion in response to different stimuli. However, some interesting trends and dose rate effects were observed, which pave the way for future investigations on the synergistic effects of multiple space stressors on immune cell function.

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Section: Discussionmentioning

confidence: 99%

Immunological Changes During Space Travel: A Ground-Based Evaluation of the Impact of Neutron Dose Rate on Plasma Cytokine Levels in Human Whole Blood Cultures

et al. 2020

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“…Though previous convergence studies Slaba et al 2010] and benchmark comparisons [Wilson et al 1988Heinbockel et al 2009aHeinbockel et al , 2009b would indicate that round-off error is of little concern, such comparisons were generally made at moderate shielding depths where round-off errors are assumed to be small. However, as HZETRN is increasingly used in atmospheric, lunar, or Martian surface applications with large material thicknesses (>50 g/cm 2 ), round-off error could be a major concern and needs to be investigated.…”

Section: Introductionmentioning

confidence: 99%