There are probably 400,000 TI's and many of them are receiving irradiation with high power DE as described in these Air Force contract documents. The IDIQ statement of objective is a good place to start (first link). IDIQ means Indefinite Delivery, Indefinite Quantity and is a type of contract where either the quantity or delivery amount or date may vary and cannot be stated clearly up front. This is the case with testing on human beings and animals for biological effects of being exposed to DE. It may last longer than the 7 year contract duration and the results cannot be quantified clearly so guidance along the way may be necessary for instance.
Solicitation Number: BAA-HPW-RHDR-2013-0002
US Air Force Research Laboratory DEBR 1989