Reactor pool cleaning method used for miniature neutron source reactor decommissioning

The invention discloses a reactor pool cleaning method used for miniature neutron source reactor decommissioning. The method includes the following steps: (1), theoretically calculating demarcation points of low level waste and deregulated waste; (2) sampling two points within the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (3), reasoning positions of the demarcation points according to nuclide specific activity and the position thereof; (4), sampling at positions closed to the outer sides of the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (5), comparing the acquired activity with a deregulating value, if the activity is smaller than the deregulating value, determining the positions to be the interface of the deregulating waste and the low level waste, peeling the portion within the positions and cleaning, and if the activity is larger than the deregulating value, repeating step (3) and (4) until the acquired activity is smaller than the deregulating value, and cleaning. By the method, sampling and measuring while peeling can be realized, secondary radioactive waste quantity can be reduced, and measuring workload and classifying time of radioactive waste can be reduced.