A nucleus of mass 234 u initially atrest emits an particle w

A nucleus of mass 234 u, initially atrest, emits an particle with a KE of 4.6 MeV. What is the KE of the recoiling daughternucleus?
1 MeV

K_D = K_a (m_a /m_d)

K_D = 4.6 x (4 / 234)