The Direct Ion Storage technology has been primarily used in Europe, specifically the DIS-1 (CERN, NPP and Medical Institutions). The Military DIS is being used by some European NATO entities.
Is is not surprising that in the USA this technology has not been in use, since until the Instadose product was developed and launched in May 2009 (not even a year ago), it is now accredited through NVLAP, thus allowing it to be used in the US for "dose of record". As I mentioned previously, this particular device version was intended solely for the medical market, photons (15 keV up to 1.33 MeV). Since its introduction, it is being used for specific activities in university, large medical facilities and some nuclear plants have purchased, again for specific functions (such as visitor, emergency kits, etc.). The current device is being used and tested at various National Labs as well as some of the US military facilities.
As a result, the survey only validates what has been the case, with a device just entering the US geographical area, with an accreditation.
I could also state the same being true for other technologies, such as RPL (radio photoluminescence), not in use at all in the US, but is Asia and in various parts of Europe. Lack of knowledge or familiarity can not be correlated to quality or ability to monitor. Mirion's goal is to bring new technologies to the world of dosimetry, and Instadose is the first of many new devices that will be brought for consideration.