[Gate-users] Gate-users Digest, Vol 180, Issue 11

[Dmitry Hits]

Hi Mounir,

Thank you very much for reply! 

Do you know how is it calculated? 
How many events should I simulated to get 1% error?

I got the same large error for the number of hits.


Cheers,

Dmitry 

> On 11 May 2021, at 18:11, Mounir BENMESSAOUD <mounir.benmessaoud at usmba.ac.ma> wrote:
> 
> Dose results interpretation (Dmitry Hits),
> Dear Dmitry,
> the error is large because the number of events is small(10000 events.), you should increase the number of events to decrease the error margin.
> 
> good luck,
> 
> 
> Le mar. 11 mai 2021 à 15:31, <gate-users-request at lists.opengatecollaboration.org <mailto:gate-users-request at lists.opengatecollaboration.org>> a écrit :
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>    1. Dose results interpretation (Dmitry Hits)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 11 May 2021 17:31:11 +0200
> From: Dmitry Hits <dmitry.hits at phys.ethz.ch <mailto:dmitry.hits at phys.ethz.ch>>
> To: Gate-Users <gate-users at lists.opengatecollaboration.org <mailto:gate-users at lists.opengatecollaboration.org>>
> Subject: [Gate-users] Dose results interpretation
> Message-ID: <6F7EDD9B-F7C1-4E6D-8FA5-1BDF5889B2F1 at phys.ethz.ch <mailto:6F7EDD9B-F7C1-4E6D-8FA5-1BDF5889B2F1 at phys.ethz.ch>>
> Content-Type: text/plain; charset="utf-8"
> 
> Hi Gaters,
> 
> I am trying to understand results output by the dose actor, which I enabled with the following lines:
> 
> /gate/actor/addActor DoseActor             dose5
>         /gate/actor/dose5/save                   results/dose_2021May11_171652_5.root
>         /gate/actor/dose5/attachTo               box5
>         /gate/actor/dose5/stepHitType            random
>         /gate/actor/dose5/setResolution          1 10 1
>         /gate/actor/dose5/enableDose             true
>         /gate/actor/dose5/enableUncertaintyDose  true
>         /gate/actor/dose5/enableNumberOfHits     true
> 
> The source is a pencil beam of protons of 100 MeV. I simulated 10000 events.
> 
> Here is the histogram I got:
> 
> 
> My question is why is the error so large? How is it calculated?
> 
> Cheers,
> 
> Dmitry
> 
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