Message: Re: doped material properties Not Logged In (login)

None Re: doped material properties 

Forum: Processes Involving Optical Photons
Re: None doped material properties (Jason Maldonis)
Date: 23 Jun, 2011
From: Joel Long <Joel Long>

Jason,

Properties related to optical physics (scintillation behavior, etc) are not handled the same way as other properties. Those properties are set via the G4MaterialPropertiesTable associated with a G4Material. In principle, you could "pass" these properties to your new, mixed material, but giving the new material a copy of the same G4MaterialPropertiesTable (if it has a copy constructor, I haven't checked), but this is almost certainly a bad idea - the new material will not have all the same properties. Some things, like its fast and slow time constants, may be, but its absorption spectrum will be completely different because of the other material mixed in. Geant4 cannot calculate these sorts of properties because they are macroscopic, dependent on things like molecular arrangement, not simple atomic composition. *We* know there is a huge difference between diamond and carbon; Geant4 just knows that one is more dense.

Hope this helps, Joel

Inline Depth:
 0 0
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

None Re: doped material properties  by Jason Maldonis <Jason Maldonis>,   23 Jun, 2011
Re: None Re: doped material properties (Joel Long)
--001636e1ebc7d2c50004a666452d
Content-Type: text/plain; charset=ISO-8859-1

Yes that helps a lot. We decided to instead literally create tiny particles
(rectangles or spheres) and phyiscally "dope" the plastic material with
them. The problem with defining the parameters for the final material (the
one we wanted to create out of the plastic and scintillator) is simply that
we do not know them! So hopefully randomly filling the plastic with a
scintillator will work.
Thanks for your help!

--001636e1ebc7d2c50004a666452d
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Yes that helps a lot. We decided to instead literally create tiny particles=
 (rectangles or spheres) and phyiscally &quot;dope&quot; the plastic materi=
al with them. The problem with defining the parameters for the final materi=
al (the one we wanted to create out of the plastic and scintillator) is sim=
ply that we do not know them! So hopefully randomly filling the plastic wit=
h a scintillator will work.<div>

Thanks for your help!</div>

--001636e1ebc7d2c50004a666452d--

1 Idea: Re: doped material properties   (Joel Long - 23 Jun, 2011)
1 More: Re: doped material properties   (Joel Long - 23 Jun, 2011)
2 None: Re: doped material properties   (Jason Maldonis - 23 Jun, 2011)
None Re: doped material properties  by Joel Long <Joel Long>,   23 Jun, 2011
Re: None Re: doped material properties (Joel Long)
Gah, between diamond and graphite. That's what I get for not checking my post carefully.

Joel

 Add Message Add Message
to: "Re: doped material properties"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews