Build up factor interpolation

August 21st, 2019
by Joseph Magill

(Qu.) SG SCK-CEN, Belgium
Dear Nucleonica Team,
As shown below is the buildup factor equal to 1 at a distance of 15 m in air for gammas with an energy of 1 MeV.
My assumption would be that for a number of mean free paths of 0 the buildup factor would be 1. If this is the case, the buildup factor at 15 meters (mfp = 0.1107) should be interpolated between 1 (the buildup factor at mfp=0) and 1.47 (the buildup factor at mfp=0.5). If I do this I get a buildup factor of 1.104.
Am I wrong in my assumption or does Nucleonica interpolate differently? (Logarithmic or spline interpolation instead of linear interpolation what is shown in the help menu).

Buildup factor interpolation

(Ans. Nucleonica Team)
Until now the buildup factor was extrapolated for a given energy from the two last tabulated values µd=0.5 and µd = 1 when µd < 0.5. But since BU = 1 for µd = 0 interpolating between µd = 0 and µd = 0.5 is a better approach and will be realised by the next deployment. Thanks again for your observations.

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