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Fig. 5 | EJNMMI Radiopharmacy and Chemistry

Fig. 5

From: A random walk approach to estimate the confinement of α-particle emitters in nanoparticles for targeted radionuclide therapy

Fig. 5

A realistic scenario of an α-particle emission cascade must take into account that the α-emissions are isotropic and statistically not correlated. 225Ac emits an α-particle in –γ-direction and the recoiling 221Fr moves the distance R1 in +γ-direction. The α-particle emitted by 221Fr will most likely be emitted in a different direction, hence, the recoiling daughter nucleus 217At recoils in a different direction by a distance R2. The subsequent α-decay will leave the 213Bi in a distance R3 from the decaying 217At. In a 3-dimensinal space the distance R1-3 between the mother nuclide 225Ac and the last daughter to be confined 213Bi is usually much smaller than R1+R2+R3≈3R

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