| 摘要 |
A counterfeit detecting method and apparatus are provided for detecting the authenticity of an article having a label containing an isotope of a chemical element. The apparatus comprises a housing, a source of gamma radiation positioned in the housing, and a gamma radiation detector positioned in the housing for detecting the radiation from the source. The gamma radiation source is selected to emit radiation which can stimulate a selected nuclear transition in the label material. A calculating device, such as a microprocessor is coupled to a detector for calculating the ratio of the number of gamma rays counted by the detector during a predetermined period of time when the article is not in position near the receiving member (NO) to the number of the gamma rays counted by the detector during a period of time equal to the predetermined period when the article is positioned near the receiving means (NR), and for calculating the ratio of the number of gamma rays counted by the detector during the period of time when the article is not in position near the receiving means (NO) to the number of gamma rays counted during a period of time equal to the predetermined period when the source is vibrated by the vibrating device (NE) and for calculating the ratio (NR/NO)/(NE/NO) and thus NR/NE. An output device provides an output indicating whether NR/NE and NE/NO are within a predetermined range. Also, an article is provided capable of being authenticated, in which the article comprises a body substantially transparent to the gamma rays and a label fixed to the body. The label includes an isotope of a chemical element.
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