Method for judging coal mine spontaneous combustion area based on detection of C14 radiation quantity

The invention discloses a method for judging a coal mine spontaneous combustion area based on detection of C14 radiation quantity. The method comprises the following steps: firstly, preparing radioactive sodium bicarbonate slurry; selecting a coal seam area with coal seam spontaneous combustion tendency easy to spontaneously combust as a coal seam detection area, and then drilling a plurality of drill holes in the coal seam detection area at equal intervals; injecting the prepared radioactive sodium bicarbonate slurry into the drill hole, and then the radioactive sodium bicarbonate slurry entering a detection area through a coal body crack; and judging a coal spontaneous combustion area, namely extracting gas for multiple times from each drill hole, performing C14 detection on the extracted gas by using a C14 detector, drawing a change curve in a C14 radiation quantity-time two-dimensional diagram, and further determining the spontaneous combustion condition of the coal seam detectionarea around the drill hol