"extensive exposure to" is a correct and usable phrase in written English.
You can use it when describing someone's experience with something. For example, "The professor had extensive exposure to the field of physics before starting his job."
Assembling the bomb requires extensive exposure to radioactive material.
With what is now known about the disease, health care providers like Dr. Liu with such extensive exposure to SARS would be quarantined and forbidden to travel.
Dr. Anderson tests switchable windows to see if they can stand up to tough conditions, including extensive exposure to ultraviolet light and long periods without maintenance.
At this spring's annual meeting with industry analysts, a gathering that many expected to be their first extensive exposure to Mr. Palmisano, Mr. Gerstner barely gave him a chance to speak.
Extensive exposure to ionizing radiation, without adequate protection for the eyes, can cause cataract formation as well as corneal and conjunctival damage.
But he acknowledged that Cyprus's extensive exposure to Greece threatened to unhinge the country's economy should Greece leave the euro zone.
UV is the most abundant human carcinogen, and protection from extensive exposure to it is a widespread human health issue.
The second group had extensive exposure to evolution (including selective and non-adaptive factors) in the introductory biology course, the advanced evolution course, and in the advanced organismal biology course.
But in 2012, Cyprus' economy was badly hit by its extensive exposure to recession-hit economy of Greece, and the country was forced to seek emergency help from international lenders.
Moreover, this training can be effective even for L2 learners who have extensive exposure to their L2 in daily life, suggesting that there is something specific about the training task that aids learning.
Analysts have long expected Chinese insurers, including the countrys second-largest life insurer, Ping An, and its largest property insurer, PICC Property and Casualty, to suffer in a down market because of their extensive exposure to equities, but the extent of China Lifes losses were alarming: twice as much as the decline in the general market during the same quarter.
