Filters for Co K radiation are usually made of iron oxide power

[slo43]

"filters for Co K radiation are usually made of iron oxide power. If a filter contains 5 mg Fe2O3, what is the transmission factor for the Co K(alpa) line? What is the intensity ratio of Co K(alpha) to Co K(beta) in the filtered beam?"

I was wondering if you could expand further as I'm stuck. I found mass absorption for Fe2O3 alpha =44.61 cm2/g and beta = 245.7 cm2/g. but since I'm not given density of fe2o3 do i just presume (5.24g/cm3) it or can i do the maths and solve without it. your help is welcomed

 

[member 553083]

. The transmission factor for the Co K(alpha) line will depend on the thickness of the filter. In order to calculate this, you will need to know the density of the Fe2O3 powder as well as the mass of 5mg. With these two pieces of information, you can calculate the thickness of the filter and then use the mass absorption coefficients to calculate the transmission factor.The intensity ratio of Co K(alpha) to Co K(beta) in the filtered beam can be calculated using the mass absorption coefficients for alpha and beta. You would divide the mass absorption coefficient for alpha by the mass absorption coefficient for beta to get the intensity ratio.