Download A35 - Ortec

6. ANALYSIS METHODS
of 0.2 for all points. The calculation is repeated in the region above the end of the peak, and the
background is:
(17)
where:
BL
BH
CH
CL
=
=
=
=
low background
high background
high channel
low channel
Multiplets
In high energy regions the background is roughly linear, and the background for peak multiplets
is calculated in an analogous manner to singlets. If the slope above the peak region is less than
the slope below the region, (that is, if the background under the peaks is declining faster than the
background above the peaks), a step is inserted at the centroid of each peak (see Fig. 186).
Fig. 186. Stepped Background.
The total height of the steps is equal to the difference between the background above and below
the peak area. The steps are smoothed over the width of the peak, and the height of each step is
proportional to the height of the peak.
171