Relating the Gamma Constant to the absorbed dose

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It is unclear from my text. Can you use the gamma constant to find the absorbed dose for a point source of photons?
 

Astronuc

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It is unclear from my text. Can you use the gamma constant to find the absorbed dose for a point source of photons?
What text is one using? What is the context?

According to this document - https://www.nrc.gov/docs/ML1122/ML11229A688.pdf (see slides 15-33) - one can use a gamma constant, Γ, to calculate exposure rate dX/dt and exposure, X, and subsequently dose rate, dD/dt and dose, D.
 
I am using Turner's Atoms, Radiation and radiation protection.
I want to calculate the dose per activity (Gy/Bq/hr) of a point source of photons to theoretically check an MCNP result. The only way I could see to do it so that the units work, with the exception of the m^2, is with the gamma constant.
 
Last edited:
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hi,
you can use the relation for photon :
fluence*dose factor

fluence is N/(4pi*d*d) and dose factor is the conversion fluence dose factor
See for example :
 
Are you referring to the mass attenuation coefficient?
 
115
34
no,
with H/phi factor,
with mass attenuation it is :
K (mGy/h)=5.74e-4*(mu/rho)*phi*E
same reference
 
I have not heard of the dose factor, but will look it up. What are its units?

Also edited my original post to clarify what I am doing.
 
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the conversion fluence dose factor is in pSv.cm2
I Don't know "
gamma constant " but the "
conversion fluence dose factor" is defined in the ICRP
 

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