safeguarding vs shielding

safeguarding

noun
  • Synonym of protection 

  • Policies and actions for the protection of children and vulnerable adults. 

shielding

noun
  • Action done by the person with the ball to protect the ball from the defender; the person concerned keeps his body between the ball and the defender. 

  • The situation, in NMR spectroscopy, in which a local magnetic field is weakened by the presence of neighbouring nuclei 

How often have the words safeguarding and shielding occurred in a corpus of books? (source: Google Ngram Viewer )