# Is it correct to calculate the number of particles

I want to calculate that how many particles will be recorded by detector with MCNP.
using the F8 tally which would provide energy spectrum, add all of data that related with full energy peak of spectrum, multiply by number of nps, then obtain the number of particles.

Hi,
With this method you will calculate the number of count in your detector for one particle. After you must multiply by the number of particles emited.
For example if you have 100 Bq of Co 60 multiply F8 by 200 and you will have counts/s

• Ericdjs
Thank you ! 100 Bq of Co-60 source multiply F8 by 200 because the Co-60 source has two different energies ? what if i need to calculate both low energy and high energy counts, is it correct that multiply the areas of different peaks by 200 with different percentages of both low energy particles and high energy particles?

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200 because 2 photons with 100 % in intensity
The normalisization factor depends of the radionuclides

200 because 2 photons with 100 % in intensity
The normalisization factor depends of the radionuclides
Thank you !
200 because 2 photons with 100 % in intensity
The normalisization factor depends of the radionuclides
thank you !