title: Organ/Tissue absorbed doses measured with a human phantom torso in the 9th Shuttle-Mir Mission (STS-91).
abstract: Organ/Tissue absorbed doses were measured with a life-size human phantom torso in the 9th Shuttle/Mir Mission (STS-91) from June 2 to 12, 1998. This is the first attempt to measure directly organ/tissue doses over a whole human body in space. The absorbed dose was measured by combination of two integrating detectors: thermo- luminescent dosemeter of Mg2SiO4: Tb (TDMS) and plastic nuclear track detector (PNTD). Both detectors were calibrated on ground using high-energy charged-particle beams. The detectors were packed in 59 cases of tissue-equivalent resin; and put into the positions of radiologically important organs and tissues in the phantom. Efficiency reductions of TDMS for high-LET particles were corrected based on the LET-differential particle fluence of space radiation measured with PNTDs. The accumulated absorbed doses during this 9.8-days mission at low-earth orbit (400 km x 51.6 degrees) ranged from 1.6 mGy at colon to 2.6 mGy at bone surface (shoulder) with a variation factor of 1.6. The absorbed doses at some internal organs were higher than the skin dose. This fact is important from the viewpoint of radiological protection for astronauts.
authors.affiliation: National Institute of Radiological Sciences, International Space Radiation Laboratory, Inage, Chibi-shi, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yasuda
authors.forename: T
authors.initials: T
authors.lastname: Komiyama
authors.forename: K
authors.initials: K
authors.lastname: Fujitaka
mesh_terms: D003359:Cosmic Radiation; D006801:Humans; D018499:Linear Energy Transfer; D019047:Phantoms, Imaging; D010969:Plastics; D011092:Polyethylene Glycols; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation; D011835:Radiation Protection; D013026:Space Flight; D013819:Thermoluminescent Dosimetry; D014781:Viscera; D014893:Weightlessness
chemical_list: D010969:Plastics; C028827:CR 39; D011092:Polyethylene Glycols