Document Details

Health Division and Biological Section of Research Division Report for the Month of March 1946
Subject Terms:
ORNL, biological, report; P-9, decontamination; medical, health physics
Document Location:
DOE INFORMATION CENTER 1 Way, Oak Ridge, TN 37831; Eva Butler; Phone: 865-241-4780; Toll-Free: 800-382-6938, Option 6; FAX: 865-574-3521; Email:
Document Categories:
Health, Safety and Environment\Worker Health and Safety
Document Type:
Publication Date:
1946 Mar 29
Declassification Date:
1953 May 28
Declassification Status:
Document Pages:
Accession Number:
Document Number(s):
MonH-86, Copy 22A
Originating Research Org.:
Clinton Laboratories
OpenNet Entry Date:
1998 Jun 16
This document contains a report for the month of March 1946 for the Health Division and Biological Section of the Research Division at Clinton Laboratories. Additional efforts are being put toward completing annual physical examinations to bring them up to date. Survey measurements during the preparation of enriched P-9 solution for the critical experiments indicated that the work was done with little increase in neutron activity and with an average air pollution of approximately 2 percent of tolerance. On two occasions during the past month clothing that had been washed and released from the decontamination laundry was found to contain contaminated spots of about 12 mr/hr. In both instances, the contamination was due to low energy beta and gamma activity which had not been observed by the usual laundry method of testing a folded garment with a G.M. counter. The automatic steam jet from waste tank W-11 to W-5 failed on the night of March 5, 1946, and permitted steam to wash radioactive iodine into the air. An air sample was collected from near the pile building which read about four times tolerance. Changes have been made in the W-11 jet which are expected to prevent a recurrence of such an accident. Experiments with small periodic doses of fast neutrons and gamma rays on CF-1 mice have advanced to the point where threshold levels of dosage are being manifested. 0.115 n per day fast neutron treatments have been found to shorten the life span of these animals significantly and there is a suggestion that 1 r per day gamma ray exposures will have some effect. At the time the present chronic experiments were undertaken, it was known that the r/n ratio for acute killing effects in mice was 7.5 to 8. The newer findings indicate that for chronic effects this ratio is 2 to 4 times greater. Several kinds of results are being obtained which indicate that fast neutrons are considerably more effective than gamma rays in causing late than in causing acute damage.

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