Radiation measurements onboard aircraft in the South Atlantic region

Federico, Claudio Antônio; Gonçalez, Odair Lélis; Caldas, Linda V.E.; Pazianotto, M. T.; Dyer, C. S.; Caresana, M.; Hands, A.

doi:10.1016/j.radmeas.2015.07.008

Cited by 12 publications

(5 citation statements)

References 23 publications

(27 reference statements)

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“…The dynamic range allows for a variety of particle species to be detected in the mixed radiation field of the atmosphere, including direct ionization from protons, ions, and the electromagnetic cascade (electrons and gamma), as well as indirect ionization from neutron interactions. RaySure has been flown on many hundreds of flights, accumulating many thousands of flight hours on commercial and executive jet aircraft [ Dyer et al, ; Federico et al, ; Getley et al, ]. Many of these flights have also carried a TEPC instrument, and these collateral data have been used to calibrate RaySure.…”

Section: The Raysure Monitormentioning

confidence: 99%

The disappearance of the pfotzer-regener maximum in dose equivalent measurements in the stratosphere

2016

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The NASA Radiation Dosimetry Experiment (RaD‐X) successfully deployed four radiation detectors on a high‐altitude balloon for a period of approximately 20 h. One of these detectors was the RaySure in‐flight monitor, which is a solid‐state instrument designed to measure ionizing dose rates to aircrew and passengers. Data from RaySure on RaD‐X show absorbed dose rates rising steadily as a function of altitude up to a peak at approximately 60,000 feet, known as the Pfotzer‐Regener maximum. Above this altitude absorbed dose rates level off before showing a small decline as the RaD‐X balloon approaches its maximum altitude of around 125,000 feet. The picture for biological dose equivalent, however, is very different. At high altitudes the fraction of dose from highly ionizing particles increases significantly. Dose from these particles causes a disproportionate amount of biological damage compared to dose from more lightly ionizing particles, and this is reflected in the quality factors used to calculate the dose equivalent quantity. By calculating dose equivalent from RaySure data, using coefficients derived from previous calibrations, we show that there is no peak in the dose equivalent rate at the Pfotzer‐Regener maximum. Instead, the dose equivalent rate keeps increasing with altitude as the influence of dose from primary cosmic rays becomes increasingly important. This result has implications for high altitude aviation, space tourism and, due to its thinner atmosphere, the surface radiation environment on Mars.

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Section: The Raysure Monitormentioning

confidence: 99%

The disappearance of the pfotzer-regener maximum in dose equivalent measurements in the stratosphere

2016

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“…Se a intensidade geomagnética continuar diminuindo, num futuro não tão distante poderão ocorrer situações extremas de interrupções parciais, ou até mesmo totais, de sistemas de telecomunicações, sistemas de posicionamento global e até mesmo graves acidentes envolvendo aeronaves comerciais. Além disso, o campo geomagnético pouco intenso aliado a períodos de alta atividade solar, pode estar relacionado a maior incidência de radiações nocivas ao corpo humano, situação que não foi observada em períodos de atividade solar baixa (BAHDWAR et al, 2002;FEDERICO, 2011;FEDERICO et al, 2015). Outro fenômeno, relacionado ao CMT, que pode influenciar a vida na Terra são as correntes elétricas induzidas geomagneticamente (GICs).…”

Section: Variações Da Intensidade Total Do Campo Geomagnético Em Santunclassified

Variações de intensidade do campo geomagnético em Santa Maria (Brasil) para os últimos 3 mil anos

Frigo

Hartmann

2018

CeN

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Earth magnetic field variations at secular scales and at hundred quilometers have internal origin at the outer core. The most important feature associated with this internal field is the South Atlantic Magnetic Anomaly (SAMA), which covers the South America and it is characterized by the lowest total field intensity at the surface. Here, we investigate the geomagnetic field variations in Santa Maria (Brazil) over the past 3 ka. Results indicate that the intensities observed in Santa Maria are the lowest of the geomagnetic field over the past 3 ka. The consequences of these field features could be the increase in the electrically charged particles reaching the low Earth atmosphere that may generate problems in the communications systems or climate changes.

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“…In the former research on radiation dose on the aircrews, detection of the dose rate on board carried by aircraft has been studied [16,17]. In the framework of the CONCORD, dose rates in the radiation field at aviation altitudes were obtained with several instruments on board during joint flights [17].…”

Section: Introductionmentioning

confidence: 99%

A Detection Method of Atmospheric Neutron Profile for Single Event Effects Analysis of Civil Aircraft Design

Song

2022

Atmosphere

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High-energy particles such as neutron act as serious threats to electronic equipment on board aircraft via Single Event Effects (SEE), but atmospheric neutron flux profile which could cover civil aviation altitude is rarely observed. To address the representative of atmospheric radiation data in SEE analysis, we propose a new method of detecting atmospheric neutron profile for civil aviation altitude. Using the sounding balloon carrying one nuclear radiometer, the radiation dose could be observed with high accuracy. Subsequently, the profile of atmospheric neutron flux can be derived on the basis of the conversion equation between radiation dose and the neutron flux. We implement two experiments, and the results show that this low-cost method could reliably obtain the vertical distribution of atmospheric neutron and might be integrated into SEE analysis of civil aircraft design.

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Radiation measurements onboard aircraft in the South Atlantic region

Cited by 12 publications

References 23 publications

The disappearance of the pfotzer-regener maximum in dose equivalent measurements in the stratosphere

The disappearance of the pfotzer-regener maximum in dose equivalent measurements in the stratosphere

Variações de intensidade do campo geomagnético em Santa Maria (Brasil) para os últimos 3 mil anos

A Detection Method of Atmospheric Neutron Profile for Single Event Effects Analysis of Civil Aircraft Design

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