Document Details

Health Physics Report on Air Activity for the Week Ending February 27, 1949
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\Public Health and Safety
Document Type:
Publication Date:
1949 Mar 08
Declassification Date:
1959 Apr 15
Declassification Status:
Document Pages:
Accession Number:
Document Number(s):
Originating Research Org.:
Oak Ridge National Laboratory
OpenNet Entry Date:
1995 Mar 10
Beginning Monday, 2/21/49 at 1:00 p.m., the air activity as shown on CAM#1 and #2 increased about 1000 recorder counts in two hours. This was equivalent to slightly more than 10 percent of tolerance. After the sudden two-hour rise, a steady rise continued until 3:00 a.m. Tuesday at which time a quick rise of 10,800 recorder counts in two hours was recorded on CAM#2. From then on until Thursday afternoon the level of activity continued to be relatively high. Friday, 2/25/49, was normal until 9:00 p.m. when the air activity as recorded on #2 and #5 began to rise. CAM#2 rose 2200 recorder counts/hour and leveled off. CAM#5 continued to rise slowly until 1:00 a.m. Saturday at which time it blocked out completely until 6:00 p.m. At 7:00 p.m. it rose sharply 6100 recorder counts/hour. The highest readings on CAM#5 seemd to occur with an east or northeast wind. The highest actvitiy was recorded on CAM#2 during a southwest wind or during an inversion. These wind directions seem to bear out the probaility that 706-D or 706-C was the source of the contamination. Graphs are attached. An estimate was made of the possible exposure of workmen in each of the three areas monitored. The exposure was estimated for each shift and averaged for the week (7 days). The average hourly rise for each shift for the week was obtained by totaling the hourly rises for the day and dividing by 8 then adding the daily averages and dividing by 7. Results are given in average percent of tolerance by shifts for week ending 2/27/49. The shift during which the greatest contamination was recorded was the 12-8 shift on 2/22/49. The average air activity for the 8 hours was 31.2 percent of tolerance in the viciinity of CAM#2. The greatest hourly rise was on 2/26/49 on the 12-8 shift between 7:00 and 8:00 a.m. The activity rose to 148 percent of tolerance before the tube blocked out. The fact that counters blocked out on several occasions might alter the figures considerably. For examle, on Saturday the counter #2 blocked out at 2:00 a.m. and did not record again until 4:00 p.m. This leaves a break in the record as to what the actual concentration of activity in the air was during this period. Tolerance is based on levels for Iodine 131 for continuous exposure.

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