Thickness Vs. for 1274 KeV.

Table 3: Thickness Vs. $l n \frac{I_{o}}{I}$ for 1274 KeV.

I_o= 12699
Source	Energy in KeV	Absorber	Thickness in cm	I	IoI	$l n \frac{I_{o}}{I}$
²²Na	1274	Zinc	0.0489	12394	1.0246	0.0243
			0.08	12009	1.0575	0.0559
			0.12	11864	1.0704	0.0680