Help with reading MCNP output

[Azael]

Im having some trouble interpreting the MCNP output file, more specificaly table 140 that describes reaction rates.

The problem of course is that the acctual reaction rates isn't written but rather things like total colissions, collions*weight, weight lost to capture etc.

How do I convert for instance the weight lost to capture into a acctual reaction rate?

The information I want to find is the breeding ratio of u-233 from thorium so I want.

[Th-232(n,gamma)-Pa-233(n, absorbtion)]/U-233(n, absorbtion).

i.e production rate of u-233 divided by consumption rate of u-233. But I don't have the slighest clue how to figure that out from the table 140 information? I have attached the table.

 

[vanesch]

Can't help you for the moment. At the end of May I will follow a course on MCNP, maybe then I'll be able to help

 

[Azael]

Fortunaly I got some help so its a solved problem :)

99% of the time spent on my masters thesis so far has only been familiarising myself with different software :( Frustration is starting to run quite high!:yuck:

 

[Devesh Raj]

Dear Azael
Please convey to me what was the answer of your question.
I also want to know.
Best Wishes

 

[alphy]

It is understandable that you are having difficulty interpreting the MCNP output file, specifically table 140 that describes reaction rates. In order to convert the weight lost to capture into an actual reaction rate, you will need to use the conversion factor provided in the MCNP manual. This conversion factor takes into account the weight of the target material, the number of simulated particles, and the simulation time.

To calculate the breeding ratio of U-233 from thorium, you will need to use the information from the table to determine the production rate of U-233 and the consumption rate of U-233. The production rate can be found by summing up the weight lost to capture for the reactions Th-232(n,gamma) and Pa-233(n, absorption) and dividing it by the simulation time. The consumption rate can be found by summing up the weight lost to capture for the reaction U-233(n, absorption) and dividing it by the simulation time.

Once you have these values, you can then calculate the breeding ratio by dividing the production rate by the consumption rate. I would also recommend consulting the MCNP manual for further guidance on interpreting the output file and calculating reaction rates. I hope this helps and good luck with your research.