Sodium24 analysis

Don't have the actaul question sheet anymore, and there is images to go up aswell but im having trouble uploading any of my original essays.
1 & 2.
Sodium-24 is an isotope used in medicine and the mining industry, as it is a gamma emitter. It is used for studies of electrolytes within the body, and also to locate leaks in industrial pipelines and oil well studies.
3.
Half-life of Sodium-24 is 14.96 hours, and it takes a further 149.6 hours or 6.23 days to become 'safe,' as 10 half-lives is what is required for an unstable isotope to become 'safe'
4.
Sodium-24 is used to m…