So Potassium 40 decays in such a way that roughly 89% of it becomes Calcium 40 and 11% of it becomes Argon 40. When they list these figures are they implying that after 1 half-life, of the 50% of the material that decayed to daughter products, 89% of that 50% is Calcium 40 and 11% is Argon 40?
Furthermore, does this mean that those will be the proportions of the daughter products in any given number of half lives? Is the partitioning of the decay probability to 89% Calcium and 11% Argon only observed at half-life intervals? Or is this constant throughout the decay chain, such as in between half-lives as well? It should be constant (89% and 11%) throughout? Right? I had recently read some confusing literature on the subject and began to doubt my own understanding.