Nuclear Chemistry dot points (1 Viewer)

[Rickdog]

hello

it would be of great help if anyone could give me some info on the hsc syllabus dot points in section 9.2, 5 nuclear chemistry

- identify one use of a named radioisotope
in industry (eg. cauesium 137)
in medicine (eg. technetium 99m)

-describe the way in which the above the named industrial and medical radioistopes are used and explain their use in terms of their chemical properties

- use available evidence to analyse benefits and problems associated with the use of radioactive isotopes in industries and medicine

thanks, ricky

 

[Dreamerish*~]

hello

it would be of great help if anyone could give me some info on the hsc syllabus dot points in section 9.2, 5 nuclear chemistry

- identify one use of a named radioisotope
in industry (eg. cauesium 137)
in medicine (eg. technetium 99m)

-describe the way in which the above the named industrial and medical radioistopes are used and explain their use in terms of their chemical properties

- use available evidence to analyse benefits and problems associated with the use of radioactive isotopes in industries and medicine

thanks, ricky

identify one use of a named radioisotope
in industry - sodium-24 is used as a leak detector.
in medicine - technitium-99m is used for medical diagnosis
describe the way in which the above the named industrial and medical radioistopes are used and explain their use in terms of their chemical properties
sodium-24 - leaks can be detected in water pipes or underground oil pipelines by adding sodium-24 as a tracer to the liquid and scanning along the pipe. no radiation will be detected if there is no leak. but if there was a leak, the sodium would seep into the soil surrounding the pipe, making it easy to locate the exact place of leakage. it has a short half-life of only 14.96 (some people would like to be exact ) so the concentration of radioisotopes in the liquid will not stay high for long.
technitium-99m - releases only low energy gamma rays so there will be no particles damaging the patien's body. almost any organ of the body may be investigated by using isotopes that are selectively taken up by the organ. technitium-99m has a half life of only 6 hours which is long enough to investigate changes in the human body but rapidly decays and so causes minimal damage. it can also be changed to a number of oxidation states which enables production of a wide range of biologically active chemicals.
use available evidence to analyse benefits and problems associated with the use of radioactive isotopes in industries and medicine
you can do some of the work yourself, can't you don't be lazy. you'll remember better if YOU do the research

 

[7minute]

http://www.csu.edu.au has some info. So does the Excel HSC Chemistry book and your textbook!

 

[Rickdog]

thanks for the help ppl :uhhuh:

 

[Casmira]

cobalt-60 is used for medicine as well as industry iirc?

another industry one is americium in smoke alarms, it works by if the air is ionised alarm doesnt sound, if the smoke blocks the ionisation, then the alarm goes off?

 

[Dreamerish*~]

cobalt-60 is used to give off low energy gamma rays, wherever they need it...
americium-241 is used in smoke alarms - it's an alpha and gamma emitter (doesn't do any damage to humans because the radiation isn't excessive) and the alpha rays ionise the air around the detector. an electrode inside the detector collects the ions and measures the electrical current produced. when there's smoke, the small solid smoke particles prevent the ions from reaching the electrode, causing a reduction in electrical current and therefore triggering an alarm

 

[Casmira]

yeh i was that close.. cough

 

[Dreamerish*~]

no you weren't

 

[xiao1985]

wut's iirc??!!

i remember co60 can be used as thickness gauge as well along with sr90...

 

[Dreamerish*~]

yeah that's it! i forgot about thickness gauges for a second there...
"with fixed geometry for the source and detector and the same material passing through them, the amount of radiation recieved by the detector depends upon the thickness of the material - thicker material absorbs more radiation and so the signal drops. this can be built into a feed-back loop to control the manufacturing process." cobalt-60, strontium-90 and caesium-137 are used because they have a low energy emission and a relatively long half-life

 

[Casmira]

yeah that's it! i forgot about thickness gauges for a second there...
"with fixed geometry for the source and detector and the same material passing through them, the amount of radiation recieved by the detector depends upon the thickness of the material - thicker material absorbs more radiation and so the signal drops. this can be built into a feed-back loop to control the manufacturing process." cobalt-60, strontium-90 and caesium-137 are used because they have a low energy emission and a relatively long half-life

took the words right out of my ... keyboard