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**EXPERIMENT ABSORPTION OF γ - RADIATION IN LEAD AND CALCULATION OF ABSORPTION COEFFICIENT µ**

Using equation (3) / slope of graph

**lnC vs d**- estimate

**µ**. This should be in units of per meter (m

^{-1}).

*The formula in the analysis are as follows :***1.**I = I

_{0}e

^{-μd}

**2.**C(d) = C

_{0}e

^{-μd}

**3.**lnC = lnC

_{0}-μd

**Data (where d is the thickness of the lead sheets):**- d(m) = 0.0121 ,0.0063 ,0.0025 ,0.0184 ,0.0146 ,0.008
- Count/min = 636 ,1050 ,1474 ,424 ,454 ,700
- C (counts/min) - background count = 28
- Find ln C

y = -0.0116x +0.0886 in excell with the tread line . I hope the axis were right :P .

So

**μ≈ -0.0116**

Using the equation was hard for me as i'm not sure which component is which , i feel like what im doing is awfully wrong. I tried to work out

**μ**by subbing in values from the table to C(d) and C

_{0}

__equation 2__i did the same for the

**3**equation and tried to solve with rules of logs , taking

**C**as background count of 28 .

_{0}I would appreciate any explanation so i can do the calculation and see what happens .

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