To simulate the interaction of gamma photons with only oxygen (O) atom

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SUMMARY

This discussion focuses on simulating the interaction of gamma photons with oxygen (O) atoms using MCNP6+. Two primary methods are proposed: the first involves modifying the material card (m card) to remove silicon from the silicon dioxide (SiO2) definition and adjusting the density accordingly. The second method utilizes the mx card to disable photonuclear processes specifically for silicon-28, allowing for interaction with only the oxygen component. Both methods serve different purposes and should be chosen based on the specific simulation goals.

PREREQUISITES
  • Understanding of MCNP6+ simulation software
  • Familiarity with material cards (m cards) in MCNP
  • Knowledge of density adjustments in simulation parameters
  • Basic concepts of photonuclear processes
NEXT STEPS
  • Research how to modify material cards in MCNP6+
  • Learn about the mx card functionality in MCNP6+
  • Explore density adjustment techniques for material definitions
  • Investigate photonuclear processes and their implications in simulations
USEFUL FOR

This discussion is beneficial for nuclear engineers, radiation physicists, and researchers involved in simulations of photon interactions, particularly those using MCNP6+ for material-specific studies.

Marina123456
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Hello! i need help in such case. I want to simulate the interaction of gamma photons with only oxygen (O) atoms in MCNP, while am using the material card for silicon dioxide (SiO2). Which card shall I use to get the photon interacted with only the oxygen component separately. Thanks for help.
 
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Marina123456,
There are two ways of doing this that I know and I am unsure what you need. You can remove the Silicon from your material definition in the m card, and also reduce the density in the cell definitions for every use to account for the loss of the silicon. (d*32/60).

The other way prevents photonuclear processes with silicon with the mx card. This is in MCNP6+. If, for example, your silicon dioxide is m6 in your input file and silicon-28 is the first entry;
Code: 
mx6:p z1=0
Ought to turn photonuclear processes off for silicon-28. (Turning things off does not work for any other process). I have never tried this!

So to be clear, these two methods do different things and I don't know what that means practically, it may depend on what you are trying to do. One takes entries on the m card out, the other turns off just photonuclear processes for selected entries on m cards.
 
Last edited by a moderator:
Marina123456 said:
Hello! i need help in such case. I want to simulate the interaction of gamma photons with only oxygen (O) atoms in MCNP, while am using the material card for silicon dioxide (SiO2). Which card shall I use to get the photon interacted with only the oxygen component separately. Thanks for help.
Whats your MCNP version?
 

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