PET achieves the human imaging mainly by detecting the rays of radioactive substances. F-FDG is the most commonly used radiopharmaceutical in the PET scanning, the fluorine of its molecular chose the radioisotope fluorine-18 which belongs to the positron emission type. There are some other radioactive substances such as: carbon-11, nitrogen-13 and oxygen-15, etc., which is a type of a positron-emitting radioisotopes. The γ rays, which will irradiate when the radioactive elements and the organization collided, can be detected by PET.

 

There are many radioactive substances need to be shielded in a PET scanning, such as radiopharmaceutical shielding. The waiting room for people who has injected radiopharmaceutical, also need to shield. Tungsten alloy shielding in medical applications has been used very extensively, its high density, high radiation absorption capacity are also well known. Different types of tungsten alloy shielding can be applied to PET and can achieve the good radiation shielding effects.

 

For the radiopharmaceuticals, we can use tungsten alloy shielding containers to shield it, i.e., to seal the radiopharmaceuticals in a tungsten alloy shielding container. For the shielding of γ ray in PET scanning process, it’s dependent on adding the tungsten alloy materials into the ring-type detecting components of PET scanner, to absorb a lot of γ-rays, thereby to play a role in weakening rays. In short, the properties of high density and environmentally friendly make tungsten alloy to provide good shielding effects to the radioactive substances or medical equipment,which depends on using a number of radioactive substances to treat diseases, moreover, tungsten alloy shielding have no side effects.