What is the simplest way to determine half life of a radioisotope with half life 100 years?
Half life determination: Part 1
Determination of t1/2 ~100 years - Simplest way.
Following actual decay measurements over time (Actual decay method) [Collé, R. (1996)]
Half life is obtained using formula
A = A0 e-λt
Slop of lnA vs t plot is λ.
λ = 0.693/t1/2
- Collé, R. (1996) obtained the half life of 63Ni by assay of radioactive disintegration for 27 long years.
- Determination of activity was done by Microcalorimetry and 4π by LSC (1968-1995).
- Samples were prepared by dissolving 63NiCl2 carrier solution using gravimetry and were sealed in ampules.
- Specific activity: 1.485x10^6 Bq/g as of 27 May 1968.
- Obtained half life was 101.1±1.4 years.
- Authors have incorporated several correction factors to address various uncertainties.
Advantage
Simplest method
Disadvantage
Difficult to obtain data for few decades with consistent detector condition
Reference
Collé,
R., and Brian E. Zimmerman. "63Ni half-life: a new experimental
determination and critical review." Applied radiation and isotopes 47,
no. 7 (1996): 677-691.)
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