GreyShield Thyroid Protectors are shaped to fit comfortably over the Adam’s Apple and are designed to provide a significant dose reduction to the radio-sensitive thyroid gland. The shields have a Lead Equivalency (LE) of 0.125 mm. The dose reduction through the shield has been independently tested and verified in clinical studies, showing a practical dose reduction in excess of 60% during CT or general X-Ray examinations and 80%+ dose reduction in independent transmission testing throughout the range 50kV to 150kV.