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Table 2 Historical parchment samples and exposure time in the x-ray beam used

From: Is there evidence for change to collagen within parchment samples after exposure to an X-ray dose during high contrast X-ray microtomography? a multi technique investigation

Sample code Year dated Exposure time in the X-ray beam (hours)
1769 C 1769* 0
1769 2 hr 1769* 2
1775 C 1775* 0
1775 2 hr 1775* 2
1817 C 1817* 0
1817 2 hr 1817* 2
1828 C 1828* 0
1828 2 hr 1828* 2
1832 C 1832* 0
1832 2 hr 1832* 2
Modern 01 N/A 2.16
Modern 02 N/A 2.36
Modern 03 N/A 12
Modern 04 N/A 0
  1. *Sample age is estimated from dates inscribed on the parchment sheets at the time of initial parchment use.