obtaining data from the lab
In 2016, the excavation team used a method known as optical stimulated luminescence (OSL) to determine the last time the collected material was exposed to light. This would provide scientific evidence that would prove the precise dating of the chamber. The results came back after almost a year. The most recent evidence indicates that the sepulchral slab and hidden cover were last exposed during the 4th century, despite earlier evidence linking the chamber to the period of the Romans before the Christian conversion. This was the same time that Constantine built the first Church of the Holy Sepulchre!
obtain data from the laboratory
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