MCNP: Can I input the X-Ray tube voltage in MCNP source specification?

  • #1
Anisur Rahman
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TL;DR Summary
Source Specification
Can I input the X-Ray tube voltage in MCNP source specification?
 
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  • #2
Anisur Rahman said:
TL;DR Summary: Source Specification

Can I input the X-Ray tube voltage in MCNP source specification?
One would put in energy or energy spectrum for a photon source. I am not aware that voltage for an X-ray tube is an input.
 
  • #3
An electron falling through a potential difference of 1V gains 1eV of kinetic energy.

So an X-ray tube powered at 100kV would be simulated with a beam of electrons of energy 0.1 MeV (SDEF ERG= are in MeV) directed at a target.
 
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  • #5
Alex A said:
An electron falling through a potential difference of 1V gains 1eV of kinetic energy.

So an X-ray tube powered at 100kV would be simulated with a beam of electrons of energy 0.1 MeV (SDEF ERG= are in MeV) directed at a target.
Even if the current value (mA) differs?
 
  • #6
mariem said:
Even if the current value (mA) differs?
The current determines the number of particles (mA/e) per sec, were e is the unit charge.

The accelerating potential determines the energy per particle.

The total energy/sec or power would be the number of particles/sec * energy/particle, and the total energy or dose deposited would be related to the integral over time of the (particles/sec * energy/particle).
 
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  • #7
Yes, as @Astronuc says the intensity is the other part of the problem. Almost all answers output by MCNP are per source particle. So no one would attempt to simulate one mA-second (a milli coulomb) of electrons. Enough particles are simulated to get a statistically useful answer and then the results which are per source particle are multiplied by the real world source activity to get flux or dose rate answers, or the total number of real world particles to get dose.

It also means that if you are simulating a 1mA tube and a 10mA tube (the same tube at the same voltage) that only one simulation needs to be done because these situations are the same. Only the maths done afterwards differs.
 
  • #8
Where can I input the electron source intensity in MCNP? How many particles will I have for an X-ray tube set at an intensity of 10 mA?
 
  • #9
Do you understand coulombs, do you understand unit charge (the charge on an electron)?
 

Related to MCNP: Can I input the X-Ray tube voltage in MCNP source specification?

1. Can I input the X-Ray tube voltage in MCNP source specification?

Yes, you can input the X-Ray tube voltage in the MCNP source specification. You can specify the energy of the photons emitted by the X-Ray tube by setting the energy distribution in the source specification.

2. How do I specify the X-Ray tube voltage in MCNP?

To specify the X-Ray tube voltage in MCNP, you need to define the energy distribution of the photons emitted by the X-Ray tube in the source specification. You can specify the energy distribution using the appropriate keywords and parameters in the source card.

3. What keywords should I use to input the X-Ray tube voltage in MCNP?

Some of the keywords that you can use to input the X-Ray tube voltage in MCNP include EG, ES, and DF. These keywords allow you to specify the energy distribution of the photons emitted by the X-Ray tube and set the X-Ray tube voltage accordingly.

4. Can I simulate X-Ray tube interactions in MCNP?

Yes, you can simulate X-Ray tube interactions in MCNP by specifying the X-Ray tube voltage in the source specification and setting up the appropriate geometry and materials for the simulation. By accurately defining the energy distribution of the X-Ray photons, you can model the interactions of X-Rays with the materials in your simulation.

5. How can I validate the X-Ray tube voltage simulation in MCNP?

You can validate the X-Ray tube voltage simulation in MCNP by comparing the results of your simulation with experimental data or benchmark calculations. Ensure that the energy distribution of the X-Ray photons in your simulation matches the expected values based on the X-Ray tube voltage you have specified. Conducting sensitivity analyses and verifying the accuracy of your model can also help validate the simulation results.

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