Calculating Transmission Factor and Intensity Ratio of Co K Radiation Filters

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Homework Help Overview

The discussion revolves around calculating the transmission factor and intensity ratio for Co K radiation filters, specifically using iron oxide (Fe2O3) as the filter material. Participants are exploring how to approach the problem given the limited information provided.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are questioning how to determine the intensity absorbed by Fe2O3 at different energies (K_alpha and K_beta) and whether the given information is sufficient to solve the problem. There is mention of using mass absorption coefficients and the Lambert-Beer law for calculations.

Discussion Status

The discussion is ongoing, with some participants suggesting resources for obtaining necessary data, while others express uncertainty about the adequacy of the information provided. There is no explicit consensus on the approach to take, but guidance has been offered regarding the use of specific coefficients and laws.

Contextual Notes

Participants note the need for mass absorption coefficients from external sources, indicating that the problem may require additional data not provided in the original question. There is also a suggestion that simultaneous equations may be necessary, though this remains unconfirmed.

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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?

agh... i have no idea where to start on that question...
 
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At the K_a energy how much of the intensity will Fe2O3 absorb? And the same for K_b? Can you figure it out from here?
 
@@a you can't figure out the intensity with that limited amount of information, right?
 
You'll need the mass abs. coeffs. for the relevant energies from the x-ray data booklet or from here http://physics.nist.gov/PhysRefData/XrayMassCoef/cover.html. I don't remember if the booklet has those but the site does for sure. If you assume a cross sectional area A for the beam and require the filter to be of the same A you can solve for it's thickness and the use the good ol' Lambert-Beer law to calculate the transmittance.
 
thank you very much! :)
 
can someone show the working out for this. Do we have to draw simultaneous equations ?
 

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