Nuclear polarizability effects in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:none /><mml:mo>+</mml:mo><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:math> hyperfine splitting

The nuclear polarizability effects in hyperfine splitting of light atomic systems are not well known. only system for which they were previously calculated is the hydrogen atom, where these shown to contribute about 5\% total correction. One generally expects become more pronounced composite nuclei. In present work we determine correction He$^+$ by comparing effective Zemach radius deduced from experimental with obtained electron scattering. We obtain a surprising result that helion yields just 3\% correction, smaller than proton.