N.J. Admin. Code § 7:28-21.2
The following words and terms, when used in this subchapter, shall have the following meanings, unless the context clearly indicates otherwise.
"Analytical x-ray equipment" means any device or combination of devices used to determine the microscopic structure or composition of material utilizing x-rays, including but not limited to x-ray diffraction, x-ray spectroscopy, x-ray fluorescence, or fluorescence x-ray spectroscopy equipment.
"Enclosed beam x-ray system" means analytical x-ray equipment in which all possible x-ray paths are fully enclosed according to the requirements of N.J.A.C. 7:28-21.5, so that any part of the body cannot enter the enclosure.
"Fail-safe characteristics" means that all failures of warning and safety systems that can reasonably be anticipated will cause the equipment to fail in a mode such that personnel are safe from exposure to radiation.
"Open beam x-ray system" means analytical x-ray equipment other than enclosed beam x-ray system.
"Safety interlock" means a device or system of devices intended to prevent either the generation of x-rays or the emergence of the primary beam from the tube housing.
"X-ray accessory apparatus" means any portion of an analytical x-ray installation which is external to the x-ray tube housing and into which an x-ray beam is directed for making x-ray measurements or for other uses.
N.J. Admin. Code § 7:28-21.2