20 Shell sample found at Tahakopa Bay, New Zealand

Shell sample found at Tahakopa Bay, New Zealand

Report on Radiocarbon Age Determination for Wk-12872

Submitter: D I Bell
Submitter””s Code: 5
Site & Location: Tahakopa Bay, New Zealand

Sample Material: Pipi
Physical Pretreatment: Surfaces cleaned. Washed in an ultrasonic bath. Tested for recrystallization: aragonite.

Chemical Pretreatment: Sample acid washed using 2 M dil. HCl for 100 seconds, rinsed and dried.

• Result is Conventional Age or % Modern as per Stuiver and Polach, 1977, Radiocarbon 19, 355-363. This is based on the Libby
half-life of 5568 yr with correction for isotopic fractionation applied. This age is normally quoted in publications and must
include the appropriate error term and Wk number.
• Quoted errors are 1 standard deviation due to counting statistics multiplied by an experimentally determined Laboratory Error
Multiplier of 1 .
• The isotopic fractionation, d 13C, is expressed as ‰ wrt PDB.
• Results are reported as % Modern when the conventional age is younger than 200 yr BP.

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