CsAP, or Cesium Biphthalate, is a type of crystal commonly used in X-ray diffraction experiments as a scintillation material. It has a high X-ray stopping power and a large light output, making it an ideal crystal for X-ray imaging applications. The crystal lattice structure of CsAP is orthorhombic, and it has a relatively high thermal conductivity and a low thermal expansion coefficient. This makes it an ideal material for use in high-resolution X-ray imaging systems that require stability and reliability. In addition, CsAP has a high radiation hardness, making it resistant to degradation from exposure to high-energy radiation.