What is the version of the following sentence with correct punctuation?

The usefulness of a molybdenum target in Xray examinations of the breast lies especially in the fact that the energy spectrum of the Xradiation emitted by molybdenum is particularly suited to the specific nature of such examinations
The usefulness of a molybdenum target, in X-ray examinations of the breast, lies especially in the fact that the energy spectrum of the X-radiation emitted by molybdenum is particularly suited to the specific nature of such examinations.