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#ifndef _Surface_MEDIUMPROPERTIES_H_
#define _Surface_MEDIUMPROPERTIES_H_
/** Constants describing material effects for a surface (for an
* angle of incidence = pi/2).
* If thickness = d:
* radLen = d/X0 (used for description of multiple scattering
* and energy loss by electrons)
* xi = d[g/cm2] * 0.307075[MeV/(g/cm2)] * Z/A * 1/2
* (used for energy loss acc. to Bethe-Bloch)
*/
class MediumProperties {
public:
MediumProperties() : theRadLen(0), theXi(0) {}
MediumProperties(float aRadLen, float aXi) : theRadLen(aRadLen), theXi(aXi) {}
~MediumProperties() {}
/** Thickness in units of X0 (at normal incidence)
*/
float radLen() const { return theRadLen; }
/** Factor for Bethe-Bloch (at normal incidence;
* for definition see above)
*/
float xi() const { return theXi; }
bool isValid() const { return theRadLen != 0 || theXi != 0; }
private:
float theRadLen;
float theXi;
};
#endif
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