§-Quick questions
NSWInvestigating ScienceModule 6: Technologies
Quick questions on ANSTO OPAL research reactor: HSC Investigating Science Module 6
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is silicon transmutation doping?Show answer
Pure silicon ingots are irradiated to convert a small fraction to phosphorus, producing semiconductor-grade silicon used in high-voltage electronics for solar arrays and electric vehicles. OPAL is one of the world's largest commercial doping services.
What is neutron activation analysis?Show answer
Trace elements can be detected at parts-per-billion sensitivity by activating samples and measuring the gamma rays emitted. Used for forensic science, archaeology and environmental monitoring.
What is indigenous artefact analysis?Show answer
Researchers have used OPAL's neutron techniques to study Aboriginal ochre samples and stone tools, identifying trade routes and pigment sources across the continent.
What is q1?Show answer
Explain how OPAL produces technetium-99m for medical imaging. [3 marks]
What is q2?Show answer
A proposal to replace OPAL's Mo-99 production with cyclotron-produced Tc-99m is debated. Discuss one advantage and one limitation of the cyclotron approach. [3 marks]
What is q3?Show answer
ANSTO holds public consultation about expanded waste storage at Lucas Heights. (a) Identify one ethical consideration. (b) Identify one piece of primary data the consultation might collect.
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