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A note on the age of radioactive tracers
Delhez, E.J.M.; Deleersnijder, E.; Mouchet, A.; Beckers, J.-M. (2003). A note on the age of radioactive tracers. J. Mar. Syst. 38(3-4): 277-286. dx.doi.org/10.1016/s0924-7963(02)00245-2
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 59211 [ OMA ]

Keywords
    Age
    Isotopes > Radioisotopes
    Tracers > Radioactive tracers
    Marine
Author keywords
    age; age of seawater; radioisotope; tracer

Authors  Top 
  • Delhez, E.J.M.
  • Deleersnijder, E.
  • Mouchet, A.
  • Beckers, J.-M.

Abstract
    The age of a water mass is often estimated experimentally using the radio-age computed from the distribution of a radioactive tracer (radiocarbon, helium-tritium). Deleersnijder et al. [J. Mar. Syst. 28 (2001) 229.] have shown that the radio-age underestimates the age of the water and is larger than the age of the radioactive tracer used for its evaluation. This result is generalized here to radio-ages computed from the ratio of two radioactive tracers. The differences between the different ages are also studied analytically and numerically as functions of the decay rate of the radioactive tracers. For small decay rates, the difference between the age of the water mass and the radio-age is shown to be proportional to the decay rate. It depends also on the level of mixing in the system; even radioactive tracers with small decay rates can provide poor estimates of the age of the water mass in a strongly diffusive flow. For small half lives, both the radio-age and the age of radioactive tracers decrease as the inverse of the square root of the decay rate. The same analysis applies to some extent to the estimates of the age of a water mass from stable tracers with known time dependent sources (e.g. chloroflurocarbons).

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