Shielding device of source mounting and demounting for nuclear logging instrument

A shielding device of source mounting and demounting for a nuclear logging instrument, comprising:

• a device base, wherein the device base is directly placed on a well stand and symmetrically spilt into a first section and a second section, one end of the first section is hinged with one end of the second section and another end of the first section is detachably connected to another end of the second section;
• a top surface of the device base is provided with a circular embedded slideway, and a middle part of the device base, located on an inner side of the embedded slideway, is detachably provided with a source receiving plate;
• and
• a shielding device body, wherein the shielding device body is of a semicircular structure, a sliding block is arranged at a bottom of the shielding device body, the sliding block is slidably assembled in the embedded slideway, the shielding device body is provided with a circular hole through which a tool of source mounting and demounting passes, and a height of the circular hole corresponds to a height of an instrument source compartment hole;
• said height of the circular hole being higher than a height of an upper surface of the source receiving plate;
• and
• the source receiving plate being configured for preventing a radioactive source from falling off by accidents, a size of a central hole of the source receiving plate being changeable according to a diameter of the nuclear logging instrument.