TGeoMixture

 Default constructor

 constructor

copy constructor

assignment operator

 Destructor

 Compute effective A/Z and radiation length

 Define one component of the mixture as an existing material/mixture.

 add an element to the mixture using fraction by weight

 Add a mixture element by number of atoms in the chemical formula.

 Define the mixture element at index iel by number of atoms in the chemical formula.

 Retreive the pointer to the element corresponding to component I.

 Return true if the other material has the same physical properties

 print characteristics of this material

 Save a primitive as a C++ statement(s) on output stream "out".

 Create the mixture representing the decay product of this material at a
 given time. The precision represent the minimum cumulative branching ratio for 
 which decay products are still taken into account.

 Fills a user array with all the elements deriving from the possible
 decay of the top elements composing the mixture. Each element contained
 by <population> may be a radionuclide having a Bateman solution attached.
 The precision represent the minimum cumulative branching ratio for 
 which decay products are still taken into account.
 To visualize the time evolution of each decay product one can use:
    TGeoElement *elem = population->At(index);
    TGeoElementRN *elemrn = 0;
    if (elem->IsRadioNuclide()) elemrn = (TGeoElementRN*)elem;
 One can get Ni/N1(t=0) at any moment of time. Ni is the number of atoms
 of one of the decay products, N1(0) is the number of atoms of the first top
 element at t=0.
    Double_t fraction_weight = elemrn->Ratio()->Concentration(time);
 One can also display the time evolution of the fractional weigth:
    elemrn->Ratio()->Draw(option);

 getters & setters

 methods for adding elements

 utilities