如何用geant4定义labr3光学属性
时间: 2023-12-19 16:05:49 浏览: 248
在 Geant4 中,可以使用 G4OpticalSurface 类来定义 LaBr3 探测器的光学属性。G4OpticalSurface 类表示两个介质之间的光学界面,可以定义反射、折射、透射等光学过程。以下是一个示例代码,演示如何定义 LaBr3 探测器的光学属性:
```c++
// 定义 LaBr3 闪烁体材料和光电倍增管材料
G4Material* lBr3 = ...;
G4Material* PMT = ...;
// 定义 LaBr3 闪烁体和光电倍增管的光学属性
G4OpticalSurface* opLBr3Surface = new G4OpticalSurface("LBr3Surface");
opLBr3Surface->SetType(dielectric_dielectric);
opLBr3Surface->SetFinish(polished);
opLBr3Surface->SetModel(unified);
G4LogicalSkinSurface* lBr3Surface =
new G4LogicalSkinSurface("LBr3Surface",lBr3Surface->GetLogicalVolume(),opLBr3Surface);
G4OpticalSurface* opPMTSurface = new G4OpticalSurface("PMTSurface");
opPMTSurface->SetType(dielectric_dielectric);
opPMTSurface->SetFinish(polished);
opPMTSurface->SetModel(unified);
G4LogicalSkinSurface* PMTSurface =
new G4LogicalSkinSurface("PMTSurface",PMTSurface->GetLogicalVolume(),opPMTSurface);
// 定义 LaBr3 探测器的光学特性
G4double lBr3_Reflectivity = 0.90;
G4double lBr3_Efficiency = 0.95;
G4double PMT_Reflectivity = 0.50;
G4double PMT_Efficiency = 0.25;
G4MaterialPropertiesTable* lBr3_MPT = new G4MaterialPropertiesTable();
G4MaterialPropertiesTable* PMT_MPT = new G4MaterialPropertiesTable();
lBr3_MPT->AddProperty("REFLECTIVITY",energy,lBr3_Reflectivity);
lBr3_MPT->AddProperty("EFFICIENCY",energy,lBr3_Efficiency);
PMT_MPT->AddProperty("REFLECTIVITY",energy,PMT_Reflectivity);
PMT_MPT->AddProperty("EFFICIENCY",energy,PMT_Efficiency);
opLBr3Surface->SetMaterialPropertiesTable(lBr3_MPT);
opPMTSurface->SetMaterialPropertiesTable(PMT_MPT);
```
在上述代码中,首先定义了 LaBr3 闪烁体和光电倍增管的材料,并使用 G4OpticalSurface 类来定义它们之间的光学界面。接着,定义了 LaBr3 探测器的光学特性,包括反射率和效率,并将它们定义为材料属性表。最后,将材料属性表分配给相应的光学界面。需要注意的是,反射率和效率的值需要根据实际情况进行调整。