Service object: ionizing radiation site;Radiological diagnosis: X-ray, radiography, tomography, dental, X-ray machine, CT protection;Radiotherapy: simulator, afterloading machine, 60Co therapy machine, accelerator, X proton knife gamma knife protection;Interventional radiology: angiocardiography, interventional therapy and protection;Nuclear medicine: protection in gamma scintillation cameras, ECT, PET and radionuclide therapy;Other disciplines: in vitro lithotripsy, bone mineral density measurement, X-ray diffractometer protection;Industrial flaw detection: X-ray flaw detection machine, gamma-ray flaw detection machine, linear accelerator protection.