Hello.
I defined my material in MCNP, but I want to add an element in it. My material is a human tissue and I want to add the element boron-10, more precisaly 30ppm of boron-10 in the material. How do I do this?
I apreciate if someone can help me
Hi Otto, the easiest thing to do is add B-10 is terms of weight fraction or atom fraction (whatever matches the tissue material composition you currently have in your model) and re-normalize the values. Of course you have to convert parts per million to the desired fraction/density.
Regards,
dimitris
Dimitrios Kontogeorgakos Thank you! However my problem is exactly how to do that. How I re-normalize the values. I can not just decrease the percentage of my material defined and add boro. Or can I? I read the manual, but is hard to understand.
How do you define 30ppm? Is this per total weight? if so, then re-normalize by dividing each weight density by the sum of all weight densities.
Unless, I have misunderstood your question. What part of the MCNP manual are you referring to?
Dimitrios Kontogeorgakos yes, it is per total weight. For exemple: 30 ppm is 0.003% of the compound in the material. Also, 30 ppm is equivalent to atomic density (or number density) 1.67E18 atoms/cm3 (for boron-10).
with these informations, I need to add the boron-10 in my material (human tissue)
Is there something you'd like to keep constant? For example, if you want the total density or total atom density to stay the same, then you can re-normalize the atom density for the tissue constituents and the added boron, by dividing each value with their sum. The result will be a material definition with the sum of atom densities equal to 1, and then assign the desired density in your cell definition. I hope this makes sense.
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