Airborne Concentration Calculation

[Wave2k]

Struggling with this.

You are trying to work out the microCuries per cubic centimeter (uCi/cc)

uCi/cc = (ncpm) (uCi) (1 liter) (saf)(efficiency) (volume) (2.22x106 cpm) (1000 cc)

uCi/cc = (ncpm) * (correction factor)(efficiency) (volume)

The correction factor is a simplification of the constants from the above first formula:
correction factor = 1 uCi * 1 liter = 4.5x10-10 2.22x10-6 cpm 1000cc



Example

20 Litres per min flowrate
5 minute sample
Background = 5 cpm
sample = 125cpm
counter efficiency = 10%
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[thegubner]

Potato, obviously.

[MarJay]

You don't say which parts of the equation correspond to which of the values you've posted... Its hard to work it out unless we know what each of the symbols means.
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[mistergixer]

[Wave2k]

[Rogerborg]

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[Villers]

I can see why you are struggling, the info given doesnt lend itself towards working out the uC/cc.

My initial reaction was to find the volume of the overall sample, i.e 20 litres x 5 minutes = 100 litres. Then find the number of CC's within 100 litres.

Subtract background counts from activity counts per minute and multiply by efficiency of the detector.

Thats how I would have started with the info in the example but then I realised I didnt know where to start applying the correction factor. Also why is it in micro curis per cc?

Im more used to working in Bq myself. The layout of what you have typed is confusing me I guess. If you are really struggling and its important I know people who are incredibly good at this sort of thing, but the info needs to be correct for it to work!
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[Villers]

double post
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[Triton Thrasher]

[binge]

[daemonoid]

[Knightsy]

https://cdn.memegenerator.net/instances/400x/24895564.jpg

But please continue...
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[carlosthejack...]

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[Triton Thrasher]

[Walloper]

[Wave2k]

Its an American test paper, so they use really odd measurements.

I most likely wont be using this kinda of formula and measurements in real life, but they want it in the test.

Its odd because in the whole entire study guide it doesnt mention Curies at all, then uses them in a formula as measurement.

I PM'd Daemonoid the paper, hopefully he can shed some light on what ive missed.

Thanks for the help though guys, some of this is really helpful to me.
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[daemonoid]

[pinkyfloyd]

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[Wave2k]

daemonoid i owe you a beer

Legend
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[Triton Thrasher]

ncpm is net counts per minute: counts per minute, net of background.

As opposed to gross counts per minute, which includes background.

They gave us some shitty formulae like that on industrial health physics. It seems to be meant to stop you thinking about what's happening and just plug numbers into the formula. It suits some people.
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Rrrrrrrrrrrrrrrrrr

[Triton Thrasher]

For those who didn't understand, I just typed up a pretty good explanation, but it vanished. Probably an Ipad thing.
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Rrrrrrrrrrrrrrrrrr

[Walloper]

[Triton Thrasher]