Calculation of absorbed radiation dosages at earth orbits from the solar flare of August 4, 1972

Details Calculation of absorbed radiation dosages at earth orbits from the solar flare of August 4, 1972 Calculation of absorbed radiation dosages at earth orbits from the solar flare of August 4, 1972

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14..470s&link_type=abstract

Kosmicheskie Issledovaniia, vol. 14, May-June 1976, p. 470-474. In Russian.

Mathematics

Logic

Health Physics, Radiation Dosage, Solar Flares, Spacecraft Environments, Geomagnetism, Magnetic Effects, Meteorological Satellites, Risk, Satellite-Borne Instruments, Solar Protons

Scientific paper

Direct satellite measurements in interplanetary space of the absorbed radiation dosage from the cited solar flare are used to calculate the dosages absorbed by spacecraft in circular earth orbits 300 km in height with angles of inclination equal to 51.5 and 65 deg. The screening effect of the geomagnetic field is taken into account. The integrated radiation dosage from the entire flare over the period between August 4 and 7 is determined to have been about 123 rad (surface dosage) and about 10 rad (depth dosage) for an effective shielding of 3 g/sq cm Al. It is then found that the surface dosage within a spacecraft in the specified earth orbit was 2.05 rad for a 51.5-deg angle of inclination and 9.1 rad for 65 deg. The dosages at a tissue depth of 5 cm were an order of magnitude lower. It is noted that the depth dosages calculated for a relative radiation biological efficiency of 3 were far lower than the 50-rem 'justified-risk dosages' adopted as a criterion of radiation danger for space flight (2 rem for 51.5 deg, 5 rem for 65 deg).

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