Sampling from a phase space file

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1

Dear FLUKA experts,

I am using a phase space file and a source routine to read the same. The source is a circular ring type where the direction vectors are towards its center (143 cm, 150 cm, 455 cm). Using a separate python code, I cross checked the position and direction vectors.
However, after analyzing the photon flux from the USRBIN output, I observed a small central region with dia approx 7 cm is devoid of photon when I took X-Y projection with Z ranging from 454 cm to 455 cm.

Any guidance regarding this matter will be very helpful.

Regards,

Riya

Helical_fixed_DOSE_Room.flair (5.5 KB)
photonfluence.txt (9.3 MB)
source_newgen.f (20.8 KB)

image1
image1640×480 19.7 KB

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direction3d
direction3d1920×1536 236 KB

directionxy
directionxy2400×2400 376 KB

2

Dear Riya,

It seems to me that the photons with energies greater than 1 keV are not covering this center region, and photons with 1 keV energy don’t have the range to reach it.

Cheers,
David

3

Thank you @horvathd for the clarification.

Regards,

Riya