A method for identification of explosives by means of neutron bombardment

摘要

The invention discloses a method and a device for identification of explosives by means of bombardment with fast neutrons. It comprises the step of the bombardment of a sample with neutrons, the energy which is greater than or equal to the positron - activation energy of nitrogen and is greater than or equal to the required energy for a neutron - proton nuclear reaction of neutrons with 16o is to 16n. It is also the of the sample as a result of the neutron bombardment posted electron - positron - annihilationstrahlung detected as a function of time. It is then the respective concentration and the concentration ratio of oxygen and nitrogen in the sample from the temporal course of the annihilation radiation to be determined and the explosive by means of the comparison of the concentration ratios of the certain concentrations of oxygen and nitrogen with the corresponding material ratios of known explosives identified. By means of the radiation with neutrons are formed at the same time the radionuclides ¹³N from the nitrogen contained and ¹⁶N from the oxygen contained, the disintegration electron - positron - annihilation radiation generated with characteristic half-lives.