(which is the recommended range for use of DuPont 534 film).
For the 5-to-10-r dose range. the assigne:
doses averaged about 35 percent lower than the actual doses, and for the l-to-5-r dose range. the assigned
doses averaged about 67 percent lower than the actual doses.
Some of the film badges were in compartments that were both hot and humid for long periods of time. A
cursory investigation of temperature and humidity effects on film-badge calibration was performed byesposing ten film badges to Co™ radiation and then immersing the badges for 24 hours in a water bath at 150
degrees F prior to film development. The films were developed from 3 to 14 days after exposure. Using
the above-mentioned calibration curve resulted in assigned doses which averaged about 12 percent higher
(and varied from 7 percent lower to 32 percent higher) than the actual doses. The conditions of this investigation are cOnsidered to have been more severe than the actual conditions encountered bythe film badges
aboard the test ships.
On the basis of the above discussion it would appear reaSonable to say that film-badge dose averages
are probably accurate to within 20 percent for the reconunended dose range of 10 to 1.000 r. and are prob-
ably accurate to within a factor of two, i1.e.. the assigned doses are presumablytoo low. for doses lower
than 10 r.
100
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