Nuclear Medicine Radiation Dosimetry by Brian J McParland
Author:Brian J McParland
Language: eng
Format: epub
Publisher: Springer London, London
The differential photon flux at point P2 (which is at the same perpendicular distance from the source as P1 but at an axial distance beyond the end of the source) is also given by (9.44) and the integrated photon flux is,
(9.48)
Similarly, the photon flux at the axial point P3 is,
(9.49)
which, for L ≫ l, simplifies to,
(9.50)
These flux calculations were for in vacuo. Consider, now, the case of an absorber of thickness t interposed between the linear source and the calculation point P1 (clearly, t ≤ h). Initially, ignore scatter and assume the source to be of photons only. Then, photon attenuation leads to a modification of (9.38),
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