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From: Francisco Ogallar Ruiz <fogallar_at_correo.ugr.es>

Date: Mon, 04 Nov 2019 17:07:14 +0100

Dear FLUKA experts,

I am writing to ask several questions that are, in reality, the

continuation of an older discussion already started here in 2017 by

Chris Theis. In particular, I will refer to the information provided by

Anton

Lechner in his answer, which is available in the following link:

http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10512.html .

Using the usrrnc.f routine, we are getting information concerning the

radionuclides created under some conditions in order to later use it for

further solid-state diffusion calculations. In this context, given the

position of a certain radionuclide, we would like to know, if possible,

the minimum distance to the nearest boundary in our FLUKA geometry.

Thanks to the discussion previously mentioned, we know that an

approximation to this distance (smaller than the real one) is available

sometimes (depending on the type of body it may not be calculated at

all). This variable is called DDNEAR and seems to be accessible in the

common CMMDNR. For our applications, we are still interested in using it

whenever it is available, but after some tests, there are some questions

that we would like to address with your help:

1. If we export DDNEAR during a call to usrrnc.f, are we really getting

the DDNEAR corresponding to our nuclide? Or are we accessing the DDNEAR

corresponding to the particle simulated just before the creation of the

radionuclide? If the second is correct, can we be positive that the

point with respect to which DDNEAR is calculated coincides with the

position of the radionuclide? Since DDNEAR is a purely geometrical

variable, this condition is enough for our purposes.

2. We have observed negative values of DDNEAR quite often (remember that

we always obtain it during a call to usrrnc.f). We would like to know if

this is a ”normal” outcome of its calculation since, even without real

physical meaning, for sure is a smaller value than the real minimum.

3. We have also noted that, for consecutive calls to usrrnc.f that

provides information about several radionuclides created in exactly the

same position, sometimes we obtain different DDNEAR for each of them.

But if the isotopes are in the same position, it should be the same.

After some tests, we have seen that the first one provided seems to be

the correct one. We suspect that this may be related to the first

question: maybe we are not accessing the DDNEAR corresponding to our

isotope, but something else. Could you shed some light on this?

Thank you very much in advance. Any help is highly appreciated.

Best regards,

Francisco

__________________________________________________________________________

You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info

Received on Mon Nov 04 2019 - 18:17:12 CET

Date: Mon, 04 Nov 2019 17:07:14 +0100

Dear FLUKA experts,

I am writing to ask several questions that are, in reality, the

continuation of an older discussion already started here in 2017 by

Chris Theis. In particular, I will refer to the information provided by

Anton

Lechner in his answer, which is available in the following link:

http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10512.html .

Using the usrrnc.f routine, we are getting information concerning the

radionuclides created under some conditions in order to later use it for

further solid-state diffusion calculations. In this context, given the

position of a certain radionuclide, we would like to know, if possible,

the minimum distance to the nearest boundary in our FLUKA geometry.

Thanks to the discussion previously mentioned, we know that an

approximation to this distance (smaller than the real one) is available

sometimes (depending on the type of body it may not be calculated at

all). This variable is called DDNEAR and seems to be accessible in the

common CMMDNR. For our applications, we are still interested in using it

whenever it is available, but after some tests, there are some questions

that we would like to address with your help:

1. If we export DDNEAR during a call to usrrnc.f, are we really getting

the DDNEAR corresponding to our nuclide? Or are we accessing the DDNEAR

corresponding to the particle simulated just before the creation of the

radionuclide? If the second is correct, can we be positive that the

point with respect to which DDNEAR is calculated coincides with the

position of the radionuclide? Since DDNEAR is a purely geometrical

variable, this condition is enough for our purposes.

2. We have observed negative values of DDNEAR quite often (remember that

we always obtain it during a call to usrrnc.f). We would like to know if

this is a ”normal” outcome of its calculation since, even without real

physical meaning, for sure is a smaller value than the real minimum.

3. We have also noted that, for consecutive calls to usrrnc.f that

provides information about several radionuclides created in exactly the

same position, sometimes we obtain different DDNEAR for each of them.

But if the isotopes are in the same position, it should be the same.

After some tests, we have seen that the first one provided seems to be

the correct one. We suspect that this may be related to the first

question: maybe we are not accessing the DDNEAR corresponding to our

isotope, but something else. Could you shed some light on this?

Thank you very much in advance. Any help is highly appreciated.

Best regards,

Francisco

__________________________________________________________________________

You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info

Received on Mon Nov 04 2019 - 18:17:12 CET

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