Discussion
Which of the following techniques involves bombarding of non-radioactive sample with neutrons :
Answer: B
The technique is NAA, neutron activation analysis.
In NAA a sample is bombarded with neutrons, usually in a nuclear reactor. Some of its nuclei capture neutrons and become radioactive, and as they decay they emit gamma rays whose energies identify each element and whose intensities show how much is present. It is extremely sensitive and was used in forensic work on gunshot residue, hair and bullet lead.
ICP-MS ionises the sample in a plasma and sorts the ions by mass, and AAS (atomic absorption spectroscopy) measures light absorbed by atoms in a flame or furnace. Neither uses neutrons. 'XBF' is not a standard technique (X-ray fluorescence is XRF).
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