New Hampshire Code of Administrative Rules
He - Department of Health and Human Services
Subtitle He-P - Former Division of Public Health Services
Chapter He-P 4000 - NEW HAMPSHIRE RULES FOR THE CONTROL OF RADIATION
Part He-P 4043 - RADIATION SAFETY REQUIREMENTS FOR ANALYTICAL X-RAY EQUIPMENT
Section He-P 4043.04 - Equipment Requirements

(a) All open-beam configurations shall be provided with a safety device which prevents the entry of any portion of an individual's body into the primary x-ray beam path or which causes the beam to be shut off upon entry into its path.

(b) DHHS/RHS may grant an exemption from the requirement of a safety device for open-beam configurations if the registrant submits an application requesting such exemptions, and:

(c) All open-beam configurations shall contain a warning device.

(d) The warning device required in He-P 4043.04(c) shall:

(e) Each analytical x-ray machine shall have an easily visible warning light labeled with the words "X-RAY ON" located near any switch that energizes an x-ray tube.

(f) The warning light required in He-P 4043.04(e) shall be illuminated only when the x-ray tube is energized.

(g) For a radioactive source contained in an analytical device, a warning light shall be located near any switch that opens a housing shutter.

(h) The warning light required in He-P 4043.04(e), (f) and (g) shall be illuminated only when the shutter is open.

(i) Warning devices shall be labeled so that their purpose is easily identified.

(j) Warning devices shall have fail-safe characteristics.

(k) Any unused port on a radiation machine source housing shall be secured in the closed position in such a manner as to prevent casual opening.

(l) All analytical x-ray equipment shall be labeled with a readily discernable sign(s) bearing the radiation symbol and the words:

(m) All open-beam configurations shall be equipped with a shutter at each port on the radiation source housing so the shutter cannot be opened unless a collimator or a coupling has been connected to the port.

(n) Each radiation machine source housing shall be equipped with an interlock that shuts off the tube if the tube is removed from the radiation source housing or if the housing is disassembled.

(o) Each radioactive source housing or port cover or each x-ray tube housing shall be so constructed that, with all shutters closed, the radiation measured at a distance of 5 centimeters from the source housing or for x-ray tubes at any specified tube rating is not capable of producing a dose in excess of 2.5 millirems (0.025 mSv) in one hour.

(p) Each x-ray generator shall be supplied with a protective cabinet which limits leakage radiation measured at a distance of 5 centimeters from its surface such that it is not capable of producing a dose in excess of 0.25 millirem (2.5 µSv) in one hour.