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OfflineCepheus
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Absorption of gamma rays..
    #8098206 - 03/03/08 03:56 PM (16 years, 2 months ago)

I'm doing a paper on gamma ray absoprtion.. I've done the experiment and collected the data.

Basically I placed radium-226 20cm from a GM tube and placed varying thicknesses of lead and other materials in between and measured the thickness and count.

Now I have lots of pretty graphs showing that absorption of gamma rays is an exponential process (and I derived a nice formula that I'm attempting to prove).

I know that the strength of the source was ~5000Bq, the distance from the GM tube (I did it at 20cm and 13cm for comparison - inverse square law),  I know the densities of the materials I placed in front of the source and of course the count (number of gamma rays detected).

How else can I analyse this data? I'm running out of ideas (and I can't think straight since I've been trawling through this data for so long). I need to get a good mark in this paper as its a decent percentage of my overall grade (not to mention it was due in last monday (as in its alread 8 days late :shock:)

Any ideas welcome :smile:


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OfflineCepheus
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Re: Absorption of gamma rays.. [Re: Cepheus]
    #8098576 - 03/03/08 05:16 PM (16 years, 2 months ago)

Also, I need to determine the absorption coefficient.

Mathematically:

x(1/2)= ln(2) / mu

mu = ln(2) / x(1/2)

Where x(1/2) is the 'half thicknes' (the thickness required to absorb half of the radiation) and mu is the absorption coefficient.

I'm pretty stumped about what to do with the data I've got.


--------------------
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:sun: "...and I know that I have to keep breathing, as tomorrow the sun will rise, who knows what the tide will bring?" :sun:

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Send any spare spore prints you might have and help the distribution :grin:

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