Which immunoassay is depicted in this picture?

Questions

Which immunоаssаy is depicted in this picture?

WHAT T 1/2 NUMBER IS USED FOR 10% OF THE TOTAL AMOUNT OF RADIOACTIVE MATERIAL LEFT IN THE BODY AFTER A NUCLEAR MEDICINE EXAM?

ALL ELEMENTS AND COMPOUNDS CAN BE CONSIDERED:

WHAT KEEPS ELECTRONS WITHIN THE SHELLS OF THEIR ATOMS?