Small modular marine radioactivity monitoring device

The utility model discloses a small-sized modularized marine radioactivity monitoring device, which comprises a radioactivity detection unit, an energy spectrum analysis unit and a shell, the shell is divided into a front cylinder and a rear cylinder by a vertical plane, the front cylinder and the rear cylinder are butted and detachably connected, and a baffle for dividing the front cylinder and the rear cylinder is also arranged in the cylinder; the radioactivity detection unit is located on the front cylinder, the energy spectrum analysis unit is located on the rear cylinder, the radioactivity detection unit and the energy spectrum analysis unit communicate through communication circular holes formed in a baffle, the detection face of the radioactivity detection unit is fully distributed on the end face of the front cylinder, and a fixing ring is arranged on the outer end face of the rear cylinder. A clamping groove is formed in the rear cylinder body, and a mounting platform is clamped in the clamping groo