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When I use

IsotopeData["Tellurium110", "DecayEnergies"]
IsotopeData["Tellurium110", "DecayModes"]

I'll have

{Quantity[4245.0, "Kiloelectronvolts"], Quantity[2723.2, Kiloelectronvolts"]}
{"BetaPlusDecay", "AlphaEmission"}

This command gives me all energy decays of all possible decays of this isotope. How can I filter the results for a specific decay mode? For example, I want to have only information about the beta decay of this isotope. How can I do that?

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This can be solved using Pick:

Pick[
 IsotopeData["Tellurium110","DecayEnergies"],
 IsotopeData["Tellurium110","DecayModes"],
 "BetaPlusDecay"
]

(* Quantity[4245.`5.", "Kiloelectronvolts"] *)

Or, slightly shorter:

Pick[##,"BetaPlusDecay"]&@@
 (IsotopeData["Tellurium110",#]&)/@
  {"DecayEnergies","DecayModes"}
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