Radiation measured during ISS-Expedition 13 with different dosimeters

Zhou, D.; Semones, E.; Gaza, Ramona; Johnson, Stephen B.; Zapp, N.; Lee, K.; George, T.

doi:10.1016/j.asr.2009.02.003

Cited by 22 publications

(11 citation statements)

References 25 publications

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“…In LEO, · D varies from 0.058 Gy y −1 to 0.12 Gy y −1 , · H varies from 0.17 Sv y −1 to 0.30 Sv y −1 , and À Q varies from 2.5 to 3.1 (Zhou et al 2007(Zhou et al , 2009a(Zhou et al , 2009b. Such a similarity means operational radiation procedures currently in place may only need minor revision to be applicable to the radiation environment on the surface of Mars.…”

Section: Free Space/surface Of Mars Comparisonmentioning

confidence: 94%

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Simulated Response of a Tissue-equivalent Proportional Counter on the Surface of Mars

et al. 2015

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Uncertainties persist regarding the assessment of the carcinogenic risk associated with galactic cosmic ray (GCR) exposure during a mission to Mars. The GCR spectrum peaks in the range of 300(-1) MeV n to 700 MeV n(-1) and is comprised of elemental ions from H to Ni. While Fe ions represent only 0.03% of the GCR spectrum in terms of particle abundance, they are responsible for nearly 30% of the dose equivalent in free space. Because of this, radiation biology studies focusing on understanding the biological effects of GCR exposure generally use Fe ions. Acting as a thin shield, the Martian atmosphere alters the GCR spectrum in a manner that significantly reduces the importance of Fe ions. Additionally, albedo particles emanating from the regolith complicate the radiation environment. The present study uses the Monte Carlo code FLUKA to simulate the response of a tissue-equivalent proportional counter on the surface of Mars to produce dosimetry quantities and microdosimetry distributions. The dose equivalent rate on the surface of Mars was found to be 0.18 Sv y(-1) with an average quality factor of 2.9 and a dose mean lineal energy of 18.4 keV μm(-1). Additionally, albedo neutrons were found to account for 25% of the dose equivalent. It is anticipated that these data will provide relevant starting points for use in future risk assessment and mission planning studies.

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Section: Free Space/surface Of Mars Comparisonmentioning

confidence: 94%

“…A TEPC was chosen for this study because of its simplicity and its extensive use on board International Space Station (ISS) and Space Shuttle missions (Zhou et al 2007(Zhou et al , 2009a(Zhou et al , 2009b. Additionally, FLUKA's ability to simulate the response of a TEPC has been well documented.…”

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confidence: 99%

Simulated Response of a Tissue-equivalent Proportional Counter on the Surface of Mars

et al. 2015

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“…Charged particles can be identified by measuring effective etch rate ratio S eff and fractional etch rate gradient G (g À1 cm 2 ), as described in Fowler (Fowler et al, 1976); O'Sullivan (O'Sullivan et al, 1999(O'Sullivan et al, , 2004 and Zhou (Zhou et al, 2006(Zhou et al, , 2007(Zhou et al, , 2009a. The method of G-S eff to identify HZE particles using CR-39 detectors is described fully in these publications so that here we will discuss only the results obtained.…”

Section: Charge Identification For the Selected Test Gcr Eventsmentioning

confidence: 98%

“…The scanned data were then analyzed and LET spectra (differential and integral fluence, dose and dose equivalent) were obtained based on the LET spectrum method using CR-39 detectors (O'Sullivan et al, 1999(O'Sullivan et al, , 2004Zhou et al, 2006Zhou et al, , 2007Zhou et al, , 2009a.…”

Section: Data Scan and Analysismentioning

confidence: 99%

Research on sensitivity fading of CR-39 detectors during long time exposure

Zhou

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Semones

et al. 2009

Radiation Measurements

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“…These fragmentation reactions thus change the physical and biological effectiveness of radiation. Light hydrogenated materials, such as water and polyethylene are mostly used to study physical and biological effects of space radiation [12][13][14][15] and liquid hydrogen is the second best shielding material against GCR [1]. A better protection from meteoroids and debris in low earth orbits could be provided by composite materials such as nextel and kevlar [6].…”

Section: Introductionmentioning

confidence: 99%