Evaluation of the neutron radiation environment inside the International Space Station based on the Bonner Ball Neutron Detector experiment

Evaluation of the neutron radiation environment inside the International Space Station based on the Bonner Ball Neutron Detector experiment

The Bonner Ball Neutron Detector (BBND) experiment was conducted onboard the US Laboratory Module of the International Space Station (ISS) as part of the Human Research Facility project of NASA in order to evaluate the neutron radiation environment in the energy range from thermal up to 15 MeV insid...

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Bibliographic Details
Published in:Radiation measurements Vol. 42; no. 9; pp. 1510 - 1520
Main Authors: Koshiishi, H., Matsumoto, H., Chishiki, A., Goka, T., Omodaka, T.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-10-2007
Elsevier
Subjects:
Bonner Ball
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
International Space Station
Isotope geochemistry. Geochronology
Neutron
Radiation environment
International Space Station
Radiation environment
Bonner Ball
Neutron
projects
NASA
neutrons
irradiation
evaluation
instruments
radiation
solar activity
energy
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Summary:The Bonner Ball Neutron Detector (BBND) experiment was conducted onboard the US Laboratory Module of the International Space Station (ISS) as part of the Human Research Facility project of NASA in order to evaluate the neutron radiation environment in the energy range from thermal up to 15 MeV inside the ISS. The BBND experiment was carried out over an eight-month period from 23 March through 14 November 2001, corresponding to the maximum period of solar-activity variation. The neutron differential-energy spectra are compared with the model neutron spectrum predicted for the inside of the ISS, and are found to be in good agreement for E > 10 keV . In contrast, the ISS model spectrum has lower flux for E < 10 keV , which is likely due to the difference in the shielding environment. The neutron dose equivalent rates are 69 and 88 μ Sv / day for the two locations inside the US Laboratory Module, representing a 30% increase due to the difference in the localized shielding environment inside the same pressurized module. The influence of the ISS altitude variation is estimated for the neutron dose equivalent rate to increase by a factor of 2 over the ISS altitude variation of 300–500 km. The increase in the cumulative neutron dose equivalent due to the most significant solar event during the BBND experiment is 0.15 mSv, which contributes less than 1% to the annual neutron dose equivalent estimated from the BBND experiment.
ISSN:1350-4487
1879-0925
DOI:10.1016/j.radmeas.2007.02.072