The thin Panatamic X film worked quite well in the radiation field of the
bunker,
The film shows about 3 or 4 roentgens total dose,
Unfortunately, the
color film had no color calibration on it and therefore the degree of coloring
of the fireball will not be known,
Development of the Panatamic X film was 2
minutes in the Berry developer BD7B and the color film was processed 5 minutes
in D-76,
|
All the cameras operated to give excellent results,
The four streak
cameras to study expansion velocities of the early fireball gave the records
shown in Figures 1 to 4,
oo
eo
gy”
‘Expansions to the right were seen through two inch slots
built in a baffle on the tower,
Expansions to the left were seen in a cancra
slit which was projected on the cab to a width of 6 inches,
slit in the camera is shown on the film whe
The angle of the
ee ee
The width of the slit image is only slightly widervthan its geometrical size,
Therefore, the recordable
—
t lasted only a short time, probably less than
end
ee
a ES
Le
ey
a cae
ee
aaa:
-.
~
\\
evidence that an absorption cut-off Teller light too early.
ee
x
i‘
there is
The exposure on
the right side as seen through the 2 inch slots was much less than the exposure on the left side,
side.
Figure 2 shows very Little exposure on the right
One expects a factor of two between the two sides because of the
effective slit sizes, but the exposure indicates a factor of at least ten.
Various studs in the baffles, rails, etc. show in the pictures as shadows,
The
studs in the slots accuretely show the scale of the record in the space direction.
Copylg
tai,
ong
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Guy