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University of California
Stable Isotope Laboratory
Earth and Planetary Sciences
1156 High Street Santa Cruz, CA 95064

Lab: (831) 459-5751
Office: (831) 459-5857
Fax: (831) 459-3074


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Prism Data Correction Calculations


Craig Constants
Coeff.
Value
C11.0676
C20.0338
C31.0010
C40.0021

Step 1: Convert the δ13Cref_gas and δ18Oref_gas of the reference gas to δ45ref_gasC and δ46Oref_gas.

δ45Cref_gas = (δ13Cref_gas + (C2 * δ18Oref_gas ))/C1
δ46Oref_gas = (δ18Oref_gas + (C4 * δ13Cref_gas ))/C3
Example
δ45Cref_gas = (2.220 + (0.0338 * 5.350))/1.0676 = 2.248
δ46Oref_gas = (5.350 + (0.0021 * 2.220 ))/1.0010 = 5.349

Step 2: Calculate δ45Csample-ref of sample gas w.r.t. reference gas

δ45C = (Rsample/Rreference gas - 1)*1000 ))/C1
δ46O = (Rsample/Rreference gas - 1)*1000 ))/C1
where R = 45/44 or 46/44 beam intensity ratio