D.C. Mun. Regs. tit. 22, r. 22-B10852

Current through Register Vol. 71, No. 49, December 6, 2024

Rule 22-B10852 - COLD-CATHODE GAS DISCHARGE TUBES

10852.1

The provisions of this section are applicable to cold-cathode gas discharge tubes designed to demonstrate the effects of a flow of electrons or the production of x-radiation as specified herein.

10852.2

Radiation exposure rates produced by cold-cathode gas discharge tubes shall not exceed ten milliroentgens per hour (10 mR/hr.) at a distance of thirty centimeters (30 cm.) from any point on the external surface of the tube, as measured in accordance with this section.

10852.3

The divergence of the exit beam from tubes designed primarily to demonstrate the effects of x-radiation, with the beam blocking device in the open position, shall not exceed Pi steradians.

10852.4

Compliance with the exposure rate limit defined in § 10852.2 shall be determined by measurements averaged over an area of one hundred square centimeters (100 cm²) with no linear dimension greater than twenty centimeters (20 cm).

10852.5

Measurements of exposure rates from tubes in enclosures from which the tubes cannot be removed without destroying the function of the tube may be made at a distance of thirty centimeters (30 cm) from any point on the external surface of the enclosure, provided:

(a) In the case of enclosures containing tubes designed primarily to demonstrate the production of x-radiation, measurements shall be made with any beam blocking device in the beam blocking position; or

(b) In the case of enclosures containing tubes designed primarily to demonstrate the effects of a flow of electrons, measurements shall be made with all movable or removable parts of such enclosure in the position which would maximize external exposure levels.

10852.6

Measurements shall be made under the conditions of use specified in instructions provided by the manufacturer.

10852.7

Measurements shall be made with the tube operated under forward and reverse polarity.

10852.8

Manufacturers shall provide, or cause to be provided, with each tube to which this section is applicable, appropriate safety instructions, together with instructions for the use of such tube, including the specification of a power source for use with the tube.

10852.9

Each enclosure or tube shall have inscribed on or permanently affixed to it, tags or labels, which identify the intended polarity of the terminals and:

(a) In the case of tubes designed primarily to demonstrate the heat effect, fluorescence effect, or magnetic effect, a warning that application of power in excess of that specified may result in the production of x-rays in excess of allowable limits; and

(c) In the case of tubes designed primarily to demonstrate the production of x-radiation, a warning that this device produces x-rays when energized.

10852.10

The tag or label required by this section shall be located on the tube or enclosure so as to be readily visible and legible when the product is fully assembled for use.

D.C. Mun. Regs. tit. 22, r. 22-B10852

Final Rulemaking published at 60 DCR 10252 (July 12, 2013)

Authority: Section 19(a)(3) of the District of Columbia Pharmacist and Pharmacy Regulation Act of 1980, effective September 16, 1980 (D.C. Law 3-98; D.C. Official Code § 47-2885.18(a)(3) (2005 Repl.)); Mayor's Order 98-48, dated April 15, 1998; Section 4902 of the Fiscal Year 2002 Budget Support Act of 2001, effective October 3, 2001 (D.C. Law 14-28; D.C. Official Code § 7-731 (2008 Repl.)); Section 15 of the District of Columbia Medical Device Manufacture and Distribution Licensure Act of 1990, effective June 13, 1990 (D.C. Law 8-137; D.C. Official Code § 48-714(a) (2005 Repl.)); and Mayor's Order 98-88, dated May 29, 1998.