This jest ion has already been asked. Search the site or search cdc.org. Keep the larger ring on the nomad. That is the protective shield.
NCBI states NOMAD presents risks that are no greater than with standard dental radiographic units to the patient or operator and the measured doses are well below recommended levels.
Another study with NCBI states backscatter radiation was determined while the operator employed various typical and atypical use scenarios……annual Maximum Permissive Dose of 50 mSv (5000 mrem).
Average annual operator exposure:
Whole body: 0.047 mSv (4.47 mrem) or 0.09% of annual MPD.
Reproductive Organs: received the highest dose of the whole body dose.
Thyroid: received the lowest dose of the whole body.
*These results are well below established occupation exposure limits and are compatible with those published by the NOMAD manufacturer*
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