Residual injury caused by irradiation with fast neutrons /
by J. S. Krebs [and] R. W. Brauer.

Description

Main Author

Krebs, J. S. (John S.)

Related Names

Brauer, R. W., author.
U.S. Naval Radiological Defense Laboratory

Language(s)

English

Published

San Francisco, California : U.S. Naval Radiological Defense Laboratory, 1962.

Subjects

Radiation.
Fast neutrons.

Summary

It is concluded that the RBE of the mice for residual radiation injury and the RBE for chronic radiation tolerance over short time intervals are the same as that for acute injury tolerance.
The LD 50 of C[3H female mice for fission-spectrum neutrons was found to be 274.5 #+ 4.2 rad. The previously reported value in the same mice for 250 kvp X ray was 632 rad, giving an RBE of 2.30. Conditioning exposure of the mice to a total neutron dose of 482.3 #+ 7.2 rad over an interval of 8-10 weeks resulted in lowering the LD 50 for neutrons by 41.8 #+ 5.9 rad, or 8.67 #+ 1.23 percent of the total conditioning dose. The previously reported value in the same mice for 250 kvp X ray was 9.58 percent of the conditioning dose. Continued exposure of the mice to 166 rad doses of neutrons at intervals of 4-5 weeks gave a median survival time of 22 weeks. This was greater than that produced by exposure to 420 rad and less than that produced by exposure to 280 rad of 250 kvp X ray given at the same time.

Note

Ntis: ad273633.
Accession No.: 57317.
"26 February 1962."

Physical Description

ii, 22 pages : illustrations ; 28 cm.

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