Calibration of the dosimeter is similar to film calibration. The dosimeters are mounted
in a circle at a 40-cm radius from tnd source and exposed to an r value of roughly *{ full-
scale deflection (i.e., a 200-mr dosimeter exposed to 150 mr). After the exposure is completed, the resultant reading is recorded, and a correction factor is taped on the dosimeter body.
Correction factor
D.6.4
calculated r valves
dosimeter reading
eC—_—_—_———X—X—X—S—SX_
Issue and Receiving
A personnel-exposure data sheet prepared from loose-leaf paper will be used for issuing
and receiving purposes. The form will have space for the following information:
rad
1. Date of issue.
2. Film-badge nuinber.
3. Issued to.
4. Person wearing badge.
5. Project.
6. Wearer’s home station.
7. Date returned.
8. Dosimeter number.
9. Dosimeter reading.
In so far as possible the monitor assigned to each recovery or working party will draw
film badges for the entire party. He will sign for all films and will be given an extra form 30
that he may record the names of the persons who receive them. Certain eienents of the Task
Force will be issued film badges on a block basis to be reissued to individuals at the discretion of the group Rad-Safe officers. Personnel-exposure data sheets should be filled out in
duplicate and returned with used badges. For military personnel, rank or rate and serial
number should be given also. One copy of the exposure form will be retained by the Photodo-
simetry and Records Section, and the other will be returned to the appropriate Rad-Safe officer. With each group of returned badges one or more control (unexpused) badges should be
included. When the film badge and dosimeter are returned, the dosimeter will be read, and the
reading will be recorded. Film badges will be sent to the Processing Section for developing
and interpretation. Processed film will be kept in a corabination-locked safe file until properly
declassified.
D.6.5 Developing
See A i geReem a
The loose-leaf form used by the Processing Section will contain the following information:
1.
2.
3.
4.
5.
Badge number.
Gross density.
Net density.
Exposure.
Date.
6. Batch number.
1. Lot number.
All film in the packet will be processed, but only the appropriate one for the exposure re-
ceived will be interpreted.
The solution will be maintained at 68°F. A suitable concentrated Hquid X-ray developer
and fixer will be used. The stop bath will be distilled water with 1.5 per cent acetic acid.
Process solutions are changed after running through approximately 2500 films, or sooner, if
deemed advisable. Unwrapped film is always handled by the edges to avoid finger marks on
either surface.
‘
D.6.6
Timing
1. Developing solution is agitated with paddle.
re
81
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