- #1
wiss
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In air, high angle scattering of alpha radiation from Am241 is almost
non existent. When a sample is pulled away from a detector the
detection rate drops as 1/r^2.
But if a thin aluminium foil is inserted in the path almost half of
the radiation disappears somewhere else, it do not reach the detector
even thou the energy spectrum is not below the detection threshold.
In 1 cm of air the nuclei take up approximately 0.1% of the area faced
by the alpha particles, In the case of 0.1 mm aluminium the area would
also be about 0.1% of the area (using a nuclear radius of 10^-14 m).
Why do 50% of the radiation get deflected very much by aluminium? I
would expect 0.1%. Can someone explain this to me?
Jonas
non existent. When a sample is pulled away from a detector the
detection rate drops as 1/r^2.
But if a thin aluminium foil is inserted in the path almost half of
the radiation disappears somewhere else, it do not reach the detector
even thou the energy spectrum is not below the detection threshold.
In 1 cm of air the nuclei take up approximately 0.1% of the area faced
by the alpha particles, In the case of 0.1 mm aluminium the area would
also be about 0.1% of the area (using a nuclear radius of 10^-14 m).
Why do 50% of the radiation get deflected very much by aluminium? I
would expect 0.1%. Can someone explain this to me?
Jonas