# X-ray Fluorescence angle question.

## Main Question or Discussion Point

First of all, I'm not the one doing this experiment. I've just finished my first year in college and I'm sort of just helping all the upper-level with their research and whatnot. So my knowledge is very limited.

With that being said, one of those student is doing X-ray Fluorescence. He was just wondering if there is an "optimal" angle to which the x-ray could be pointed to get the best results.

Here is a pic from wiki which sort of shows the basic set up. He was thinking maybe a 120 degree angle would be good or maybe 90 degrees (Like in the picture).

Bear in mind that he didn't really ask me to do research or anything. I just wanted to find out so he didn't have to take the time to figure it out by trial and error.

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MATLABdude
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Are you sure this was for X-Ray fluorescence, and not Bragg Diffraction?
http://en.wikipedia.org/wiki/Bragg_diffraction

If it is indeed Bragg diffraction, the angle is supposed to be varied. If not, unfortunately, I have nothing to add, save for the basic law of reflection: angle of incidence is the same as the angle of reflection (when measured from the normal to the reflecting surface).

^ Thanks for that. Sorry for the late reply. I was really busy this weekend.

I'll ask him about it today and will get back to you. I'm pretty sure he told me that he was doing X-Ray Fluorescence. I'm sure he knows about the basic laws of reflection. I think the question was more what angle is best so the detector "picks" up the "bounce" from the sample the "clearest". (I used quoted words since I can't think of any technical names for them. So I hope that clarifies the question more.)

Now about the Bragg Diffraction, he never mentioned it. So I'm going to assume that is not what he is doing. Nevertheless, I will ask him more about it and hopefully later on today I can get you more details.

Thanks for taking the time to reply.