Dose rate measurement through MCNP

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Discussion Overview

The discussion revolves around calculating dose rates (in Gy/h or rad/h) from a point source using the MCNP simulation code. Participants explore methods to convert MCNP tally results into dose rates, focusing on the F6 tally output and its conversion to Gray or rad.

Discussion Character

  • Technical explanation, Mathematical reasoning, Homework-related

Main Points Raised

  • One participant seeks to calculate dose rates from a point source using MCNP and questions how to convert F6 tally results (MeV/g) into dose rates (Gy/h or rad/h).
  • Another participant provides information on the conversion factors between Gy and J/kg, as well as between eV and J, suggesting this may be helpful.
  • A third participant reiterates the conversion knowledge but emphasizes the need to determine the dose rate specifically, asking how to achieve this from MCNP outputs.
  • One participant suggests that MCNP results are based on a single particle and proposes multiplying by the number of particles emitted per second to find the dose rate.

Areas of Agreement / Disagreement

Participants express uncertainty about the specific method to derive dose rates from MCNP outputs, with some agreement on the conversion process but no consensus on the complete approach.

Contextual Notes

The discussion does not clarify the assumptions regarding the number of particles emitted or the specific conditions under which the calculations are made, leaving these aspects unresolved.

Who May Find This Useful

Individuals interested in radiation dose calculations, MCNP users, and those studying radiation physics may find this discussion relevant.

Salman Khan
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I am interested to calculate dose rate (gy/h, rad/h) from a point source at a certain distance through MCNP. If I use F6 tally it will give answer in Mev/g which can be converted to Gray or rad by using FM card, but I don't know how can I find dose rate like rad/h or g/h.?
 
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Hi,
1 Gy = 1 J/kg
1 eV = 1.6022E-19 J
hope it's help
 
PSRB191921 said:
Hi,
1 Gy = 1 J/kg
1 eV = 1.6022E-19 J
hope it's help
I know to convert F6 tally (Mev/g) to dose (Gray) but how to find dose rate i.e Gray/hour from MCNP ?
 
mcnp gives the result for one particle. Simply multiply by the number of particles emitted per second
 
Ok thanks
 

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