Section 325.5067. Items containing tritium, promethium-147 or radium.

Except for persons who apply tritium, promethium-147 or radium to, or persons who incorporate tritium, promethium-147 or radium into, the following products, a person is exempt from these rules to the extent that he owns, receives, acquires, possesses, uses  or transfers the following products:

(a)   Timepieces or timepiece hands or dials containing not more than the following specified quantities of radioactive material and not exceeding the following specified levels of radiation:

(i)   25 millicuries of tritium per timepiece.

(ii)   5 millicuries of tritium per hand.

(iii)    15 millicuries of tritium per dial; bezels when used shall be considered as part of the

dial.

(iv)   100 microcuries of promethium-147 per watch or 200 microcuries of promethium-147

per any other timepiece.

(v)   20 microcuries of promethium-147 per watch hand or 40 microcuries of promethium- 147 per other timepiece hand.

(vi)   60 microcuries of promethium-147 per watch dial or 120 microcuries of promethium- 147 per other timepiece dial; bezels when used shall be considered as part of the dial.

(vii)     The levels of radiation from hands and dials containing promethium-147 will not exceed, when measured through 50 milligrams per square centimeter of absorber:

(aa) or wrist watches, 0.1 millirad per hour at 10 centimeters from any surface. (bb) For pocket watches, 0.1 millirad per hour at 1 centimeter from any surface.

(cc) For any other timepiece, 0.2 millirad per hour at 10 centimeters from any surface.

(b)   Timepieces or timepiece hands or dials containing not more than the following specified quantities of radium and meeting the following expressed conditions:

(i)   0.15 microcuries of radium per watch.

(ii)   0.03 microcuries of radium per watch hand.

(iii)   0.09 microcuries of radium per watch dial.

(iv)   0.20 microcuries of radium per clock.

(v)   0.04 microcuries of radium per clock hand.

(vi)   0.12 microcuries of radium per clock dial.

(vii)   The timepiece is not a pocket watch.

(viii)    Timepieces or timepiece hands or dials containing radium which were manufactured before the effective date of these rules.

(ix)    The timepiece is marked or coded to identify the date of manufacture and that it contains radium.

(x)   The timepiece emits sufficient luminosity, omitting photoactivation, that its dial can be read in the dark during its entire design lifetime.

(c)   Lock illuminators containing not more than 15 millicuries of tritium or not more than 2 millicuries of promethium-147 installed in automobile locks. The levels of radiation from each lock illuminator containing promethium-147 will not exceed 1 millirad per hour at 1 centimeter from any surface when measured through 50 milligrams per square centimeter of absorber.

(d)   Precision balances containing not more than 1 millicurie of tritium per balance or not more than 0.5 millicurie of tritium per balance part.

(e)   Automobile shift quadrants containing not more than 25 millicuries of tritium.

(f)   Marine compasses containing not more than 750 millicuries of tritium gas and other marine navigational instruments containing not more than 250 millicuries of tritium gas.

(g)    Thermostat dials and pointers containing not more than 25 millicuries of tritium per thermostat.

(h)   Electron tubes, including spark gap tubes, power tubes, gas tubes including glow lamps, receiving tubes, microwave tubes, indicator tubes, pick-up tubes, radiation detection tubes and any other completely sealed tube that is designed to conduct or control electrical currents, if the level of radiation due to radioactive material contained in each electron tube does not exceed 1 millirad per hour at 1 centimeter from any surface when measured through 7 milligrams per square centimeter of absorber and if each tube does not contain more than 1 of the following specified quantities of radioactive materials:

(i)    150 millicuries of tritium per microwave receiver protector tube or 10 millicuries of tritium per any other electron tube.

(ii)   1 microcurie of cobalt-60.

(iii)   5 microcuries of nickel-63.

(iv)   30 microcuries of krypt`on-85.

(v)   5 microcuries of cesium-137.

(vi)   30 microcuries of promethium-147.

(j)   Ionizing radiation measuring instruments containing, for purposes of internal calibration or standardization, a source of radioactive material not exceeding the applicable quantity set forth in rule 147.

History: 1954 ACS 85, Eff. Dec. 3, 1975.