180
Teo
9
°
OIAMETER (MICRONS)
140
100
80
60
40
20
!
2
3
10
2
30
©
SO
60
70
80
90
39
39.9
PERCENTAGE LESS THAN INDICATED DIAMETER
Pig. 4.2
Size Distribution or Active Aerosol
Particles from Shot 1
appeared to have errived at the filter in the form of liquid droplete,
as shown by Fig. 4.3, @ reproduction of an autograph of the filter on
type K X-ray film. Examination of these active areas of the filter
under the optical microscope revesled simply a deep tangled deposit of
crystalline forms, with no specific resolvable source of activity other
than the whole generalized mass covering the autograph. On the other
hand, pillipores exposed topside on YAG 40 were free from radioactive
drop indications, as shown by the X-ray autograph also reproduced in
Fig. 4.3
Microscopic examination of these filters autoradiographed with
Eastman type NTB stripping film by a slightly modified technique developed
mterial
at this Laboratoryl0/definitely associated the activity with
flaky or ash-
hardly deseribable as particles or crystals,
They were
like, quite large (~ 10 p to 70,,) and generally distributed or smeared
few
out in nebulous patches, as iliustrated in Fig. 4.4.
coral grains,
There were a
In some areas of high concentration, the active material
85