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Supercomputers Help Estimate Astronauts Radiation Risk

By MedImaging International staff writers
Posted on 19 Apr 2018
A new study reveals that a space vehicle with relatively minimal shielding and a high inclination polar orbit could expose astronauts to high exposures of cosmic radiation and solar particle events.

Researchers at Texas A&M University (TAMU; College Station, TX, USA), the U.S. More...
National Aeronautics and Space Administration (NASA; Houston, USA), and the Mayo Clinic Arizona (Scottsdale, USA) investigated potential radiation risks facing astronauts that would have operated the Manned Orbiting Laboratory (MOL), a mission planned by NASA in the 1960’s, but which never actually flew. Mission documents were recently declassified.

The MOL was conceived as an experimental laboratory for human spaceflight, but was recast as a secret reconnaissance platform in 1965 during the height of the Cold War. The vehicle would have travelled in low-earth orbit and passed repeatedly over the northern and southern polar regions to better spy on the Soviet Union. In August 1972, three years after the MOL mission planning was discontinued due to the emergence of cheaper, unmanned satellites, the Earth experienced a historically large solar particle event. The researchers explored how typical radiation and a solar flare from would have impacted MOL pilots.

They focused on radiation from two sources: solar particle events (SPEs) and galactic cosmic rays (GCRs). The researchers first modeled the MOL's orbit profile, the space weather and geomagnetic forces from those years, and the particle and heavy ion transport that such a trajectory would have encountered. Then, using a supercomputer requiring 150,000 computational hours, they found that under normal conditions, the MOL crew would have endured 113.6 millisievert (mSv) to their skin and 41.6 mSv to blood forming organs during a 30-day flight, well within the exposure limits for NASA astronauts.

However, during the "worst-case scenario" of the 1972 solar storm, their skin would have been exposed to 1,770 mSv, while their organs would have experienced 451 mSv, toxic doses of radiation. Based on animal studies, they concluded that such exposure would have caused nausea, vomiting, fatigue, and possibly skin burns to crew. Without rapid instigation of medical countermeasures, the risks could have been even more severe, affecting both short and long-term human health. The study was published on April 4, 2018, in npj Microgravity.

“Given the intended future of human spaceflight, with efforts now to rapidly expand capabilities for human missions to the moon and Mars, there is a pressing need to improve upon the understanding of the space radiation risk,” said lead author Jeffery Chancellor, MSc, of the TAMU department of physics and astronomy. “I think the research will have a huge impact for commercial space flight. It gives some insight to people who are trying to come up with ideas for orbiting hotels, or to SpaceX or Virgin Galactic who want to do tourist flights, in terms of what they have to address in order to protect the crew and customers.”

Accelerated ions in cosmic radiation interact differently with objects and people. While X-rays can be blocked by lead shields, GCR ions can become more dangerous when interacting with metals, generating secondary particles that have biological effects, such as an accelerated development of atherosclerosis, rapid progression of advanced aortic root lesions, reduced lesional collagen, and intima media thickening of the carotid arteries. Space travel also affects other organs; the heart, for example, changes shape and becomes more spherical.

Related Links:
Texas A&M University
U.S. National Aeronautics and Space Administration
Mayo Clinic Arizona

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87 (71.048736572266): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (59.127807617188): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (41.961669921875): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (36.001205444336): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
91 (89.883804321289): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (87.976455688477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
106 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
107 (59.843063354492): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (51.975250244141): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
110 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
111 (50.067901611328): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (600.09956359863): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (726.93824768066): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (717.8783416748): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
115 (128.03077697754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
116 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
117 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
118 (35.04753112793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
119 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
120 (35.04753112793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
121 (42.200088500977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
122 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
123 (329.97131347656): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 22401.094436646): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
125 (560.04524230957): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294773227 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294773227 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 7694.0059661865): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (115.87142944336): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
128 (38.862228393555): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (29.087066650391): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
130 (38.862228393555): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (29.087066650391): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
132 (298.97689819336): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (98.943710327148): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
134 (34.093856811523): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (27.894973754883): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
136 (494.95697021484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (330.92498779297): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=211
139 (30.040740966797): SELECT name FROM jos_deeppockets WHERE id=211
140 (579.833984375): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (462.05520629883): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
143 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
144 (!!!!! 8868.932723999): TRUNCATE TABLE jos_trademed_module
145 (107.0499420166): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (59.127807617188): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294773227 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (896.93069458008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
150 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
151 (!!!!! 1196.8612670898): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
152 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
153 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
154 (42.915344238281): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294773227 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294773227 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (34.093856811523): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=211 or channel_id is null)
156 (31.948089599609): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=211 or channel_id is null)
157 (34.093856811523): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
159 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294773227 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294773227 AND published='1' LIMIT 1
160 (90.837478637695): select jos_twitters.link from jos_twitters where cat=10
161 (31.948089599609): select jos_facebook.link from jos_facebook where cat=10
162 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
163 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10