Nuclear Safety Program Annual Progress Report: for Period Ending December 31, 1968 Page: 30
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30
Table 1.8. Summary of Impactor Data from Run 114
Sample 1 2 3 4
Time of sampling, min 35 220 750 1130
Particle size (MMD),
Iodine 0.24 0.32 0.24 0.23
Cesium 0.25 0.27 0.23 0.25
Tellurium 0.26 0.34 0.22 0.15
Ruthenium 0.32 0.26 0.21 0.17
Antimony 0.26 0.26 0.26size distribution in all samples. Similar data are available for run
108, which was described previously. 5
Discussion of Results
Forms of Radioiodine Present in CRI Condensate
Since most of the iodine collected in the CRI condensate was exposed
to relatively large amounts of stainless steel surface, it would be logi-
cal to assume that most of it would undergo electrochemical reduction
and would remain as iodide ions in the collected fractions. The presence
of organic iodine was almost precluded by the high gas-to-liquid volume
ratio. In order to demonstrate that this was indeed the case, fresh sam-
ples of condensate were extracted with CC14, which would be expected to
remove both free iodine and organic iodides. By reextracting the CCl4
with a dilute NaHSO3 solution the difference between CH3I and free 12 was
obtained. Details of this ORNL procedure are reviewed in a LOFT-support
document.11 In run 109 the partition between the three forms was as fol-
lows (sample 3, pH = 8):
Reduced iodine (I-) 99.95%
Organic iodides (CH3I) 0.035%
Free iodine (I2) 0.015%
In run 110 the partition was even more in favor of reduced iodine, since
less than 1 part in 1400 extracted. The pH was 7.1.
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Oak Ridge National Laboratory. Nuclear Safety Program Annual Progress Report: for Period Ending December 31, 1968, report, June 1969; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc100481/m1/78/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.