X-ray absorption & fluorescence

• Absorb: compute X-ray absorption for powder XRD capillary samples (11BM page)

• MuCal: calculate X-ray absorption, fluorescence and more (by C. Segre @ IIT/ANL)

Absorption Length

Alternatively Attenuation Length is defined as the distance into a material where the x-ray beam intensity has decreased to 1 / e, or about 63% of the incident beam. The X-ray beam intensity at depth x into a material is calculated by Beer-Lambert law:

I(x) = e^(-x/lamda)

ln(1/e) = ln(e ^-x/Lambda)

1 = x/Lambda

1/lamda = x

1/mu = x