To convince another chemist that carbon-14 (C-14) is responsible for the radioactive contamination detected in the LiOH when neutralized, you can present the following evidence and arguments:
Radioactive Decay: Explain that carbon-14 is a radioactive isotope that undergoes radioactive decay over time. It emits beta particles during decay, which can be detected through appropriate radiation detection methods.
Source of Carbon-14: C-14 is naturally present in the atmosphere, primarily resulting from cosmic ray interactions with nitrogen in the upper atmosphere. It becomes incorporated into living organisms through photosynthesis and is eventually distributed throughout the environment.
Reactor Processes: Highlight that reactors, especially those using graphite moderators or carbon-containing materials, can release carbon-14 into the coolant loop. This can occur due to corrosion or erosion of carbon-based components, or due to the presence of carbon-14 in the fuel itself.
Activity Removal by Neutralization: Explain that when the contaminated LiOH solution is neutralized, the radioactive activity disappears. This observation indicates that the contamination is likely due to an acidic component that becomes neutralized during the process. Carbonic acid (H2CO3), formed by the reaction of carbon dioxide (CO2) with water, can be a potential source of carbon-14 contamination.
Feather Test: Describe the feather test, which involves placing a feather near the suspected radioactive material. If the feather is attracted to the source, it suggests the presence of beta particles, which aligns with the properties of carbon-14. Demonstrate the feather test and show the attraction between the feather and the material.
Correlation of Findings: Highlight the correlation between the disappearance of activity upon neutralization and the detection of beta energy during the feather test. Emphasize that these observations strongly indicate carbon-14 as the source of contamination.
Expert Opinions and Literature: Reference scientific literature, research papers, or authoritative sources that discuss the occurrence of carbon-14 contamination in reactor coolant loops. Cite expert opinions or studies that support the possibility of carbon-14 release and subsequent contamination.
Collaboration and Further Analysis: Offer to collaborate with the other chemist to conduct additional tests or seek expert advice if necessary. This demonstrates your willingness to explore the issue together and find a satisfactory resolution.
By presenting this evidence, explanations, and willingness to collaborate, you can make a convincing case that carbon-14 is the likely culprit for the radioactive contamination detected in the LiOH solution when neutralized.