2. At zero time the timer is started, and the film is ,laced in developer and let stand for
3 min.
3. Film is removed and allowed to drain for not more than a few seconds.
4. At +3 min, the film is immersed in stop bath and agitated for 10 sec.
5. Film is placed in fixer for 10 min.
6. Film is placed in wash for 30 min.
7. Film is. placed in dryer until completely dry.
At least one control and one calibrated film will be processed with each batch.
D.6.7
Densitometry
1. instrument {s turned on and warmed up for 10 or 15 min until pointer becomesstable.
2. Operator positions himself so that the meter is at about eye level and in the center of
his field of vision.
$. Densitometer calibration is performed by the use of a calibrated-density step-wedge.
The original step-wedge readings should be duplicated on future calibrations with a drift of
+2 divisions or less.
4. Instrument must be checked for drift after reading film with densities in the range
4to 6.
5. Prior to reading, film should first be visually analyzed for light streaking or contamination. In the event of uneven densities an average should be recorded.
6. Only density readings under the double thickness of lead will be taken and recorded on
the film-processiug form.
1. The densitometer is always turned to the off position when not in use. This prolongs
the life of the light source.
8. Films are filed in numbered and dated paper envelopes, which in turn are placed in
cardboard filing boxes.
D.6.8
Recording
Densities appearing on the processing sheet will be interpreted in milliroentgens from the
calibration curve. The exposure will then be recorded on the personnel-exposure data sheet
and on the individual’s exposure record.
Individual exposure records will be kept on 5 by 8 cards in a Kardex file. These cards
will contain the following information:
1. Name.
2. Project.
3. Home station.
4. Date.
§. Badge number.
6. Exposure.
1. Accumulated dose.
8. Dosimeter reading.
Cards will be made up as far in advance as is possible for each person likely to receive
any exposure.
D.6.9
Reports
It is contemplated that the following reports will be made daily after shot time: (1) accumulated exposure of monitors and helicopter pilots and (2) all persons whose exposure exceeds
ar.
.
Upon completion of the operation a master list of all exposures will be prepared. The
final repository for film records will be the Division of Biology and Medicine, AEC; the final
repository for all films will be AFSWP. It will be necessary to forward reports of exposures to
the homestation of each civilian film-badged.
82
.