CHAPTER 4
ANALYSIS OF DATA
4.1
GENERAL COMMENTS
There are several points of interest in the following discussion of tables and results.
These are ultraviolet cutoff, certain compared strengths of absorption in the spectra, the vari-
ous atoms and molecules present in the several shots, and the rotational temperatures of the
molecules.
4.2 ULTRAVIOLET CUTOFF
All the spectra studied for this report show a fairly abrupt cutoff of ultraviolet radiation
centered above 3000 A (Table 4.1). This cutoff cannot be attributed, in any of the cases
Table 4.1 —APPROXIMATE ULTRAVIOLET CUTOFF VALUES
Shot
Exposure
time
Greenhouse Dog
Buster Baker
Buster Charlie
Total
Total
0-20 msec
Tumbier-Snapper 2
Total
Tumbler-Snapper 7
Mike
0-100 usec
Total
Tumbler-Snapper 3
King
Total
Yield,
kt
3.49
14.0
3600
3600
3450
1.17
3450
30.7
1.0~1.1 sec
{alao total)
Cutoff,
A
14.6
10,000
540.0
3350
3300
> 3600
> 3600
Studied, to the normal atmosphere between the bomb and the spectrograph. It must be the reSult of an attenuating medium surrounding the weapon and created by the explosion; but, from
the Spectra described in this report, the identity of such an absorber ia not apparent.
However, recent observations with low-dispersion spectrographs at Operation Upshot-
arothole appear to have established the existence of ozone in equivalent thicknesses of several
atten around the bomb during the time up to the minimum. It would be informative to
™mpt to describe the cutoff in terms of the intensity distribution of the ozone absorption
*ectrum, but the well-known wavy form of the spectral curve of ozone was not detected. This
ne be due to the presence of many bands in the cutoff region, such as those of the S-R
em.
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