washed briefly, treated with Kodak HE-1 hypo eliminator, washed for 5 minutes in run-
ning water, rinsed in a wetting agent, and dried in a Fisher anhydrator for 40 to 15
minutes.
A set of calibration films was processed with each batch of film. These flims had
been exoged to a standard Sr”—Y™ gource for predetermined lengths of time. A density~versus-expoaure curve was plotted from these filme. The curve was then used to determine the radiation dose received by the films thet had been exposed to the surface
contamination.
Density measurements on the processed filin were made with two densitometers.
of these was a Macbeth-Ansco Color Densitometer equipped with a 0.1-mm-diameter
aperture and the other was a Los Alamos Film Nenaltometer, manufactured by the
One
Eberline Instrument Division of the Reynolds Electrical and Engineering Company, Ino.
Depth-dose measurements were made .n the leading edge of the aircraft just Inboard
of the engine and, also, on the tip tank.
Film Type
Range
Emulsion
Total Thickness*
rep
mg/cm"
6135
0.02~-2.0
Double
34.0
0523
DF-19
0.4 4.0
4.0 70.0
Single
Singte
28.4
27.0
*Inelndes both emulsion and film support or backing.
allow a comparison between the apparent beta-gamma ratios near and at a greater diatance from the stronger gammafield that exists at or near the jet engine.
As a practical application of the absorption measurements, an attempt was made to
deem
CHARACTERISTICS OF FILMS USED
fee kn hte mea or ee Tee
TABLE 2.1
‘chese two positions were chosen in order to
iaay
evaluate tke protection offered by various types of gloves. This involved cutting a representative swatch from each type of glove and interpesing the material between the film
and the contaminated surface. By comparing inese films with siinilar films exposed to
the same area without the interposed swatch, the reduction in dose caused by the glove
INSTRUMENTATION
2.2.1 Military Issue Instrument. The T1B is a standard Air Force instrument used
for gamma survey. Since detailed specifications are readily available through Air Force
channels, it will not be described here.
2.2.2 Densitometers. The densities of the exposed filma were measured by two densitowmeters.
ne was the Ansco color densitomater.
It haa a urable range of from 0 to
6 density units. For the purpose of this study, it was fitted with an aperture having a
diemeter of 0.1 mm. It was used primarily for determining the density of the small
areag offilm darkened by exposure to particulate contamination. The other densitometer
was the Los Alamos film densitometer, Model FD-2, manufactured by the Eberline Instrument Divisicn of the Reynolds Electrical and Engineering Company, Inc. This in-
18
SECRET
TRO TRTOT
2.2
TRGEMIT
could be determined.