Final answer:
There are materials available that can be used as a substitute for lead, such as titanium and bismuth.
Step-by-step explanation:
False. There are materials available that can be used as a substitute for lead. One example is titanium, which is often used in place of lead for radiation shielding in some medical and industrial applications. Another example is bismuth, which has similar density and can be used as a substitute in certain applications where lead is traditionally used.