Iagnostic Radiography-How shielding is used in Diagnostic Radiography as part of radiation protection

Background information:
Radiation dose to patients and staff is minimised by using the following principles:1time:minimal time of radiation exposure.2-distance:maximal distance from source of radiation
3-shielding-affectively blocking radiation
ASSIGNMENT QUESTION:
Explain how shielding is used in Diagnostic Radiography as part of radiation protection.Your explanation must include 3 examples of shielding and an explanation of how the substance for your examples is used and why it is an effective radiation protection substance.”
500 WORDS
NOTE: THIS ASSIGNMENT IS DISCIPLINE SPECIFIC (ONLY DIAGNOSTIC RADIOGRAPHY), DO NOT COVER RADIATION PROTECTION FOR EACH OF THE MEDICAL RADIATION SCIENCES DISCIPLINES.

CRITERIA:
Introduction-define and introduce major issues
Contentanswers the assignment question, explains and discusses the major issues of the question. Explains in context with the Diagnostic Radiography profession.
Conclusion-draws the key issues together and relates to the introduction.
Referencing: HARVARD Dan 3
Logical progression and style
LAnguage-sentence structure, grammar, spelling.Penalty will be awarded for >10% over the word limit (ie. 500 words