Table I Design operating range (kilovolts peak) Measured potential (kilovolts peak) HVL (millimeters of aluminum) Dental Intraoral Units manufactured after December 1, 1980 Medical X-ray Units manufactured before June 10, 2006 and Dental Intraoral Units manufactured on or before December 1, 1980 Medical X-ray Units manufactured on or after June 10, 2006 Below 51 30 1.5 0.3 0.3 40 1.5 0.4 0.4 50 1.5 0.5 0.5 51 to 70 51 1.5 1.2 1.3 60 1.5 1.3 1.5 70 1.5 1.5 1.8 Above 70 71 2.1 2.1 2.5 80 2.3 2.3 2.9 90 2.5 2.5 3.2 100 2.7 2.7 3.6 110 3.0 3.0 3.9 120 3.2 3.2 4.3 130 3.5 3.5 4.7 140 3.8 3.8 5.0 150 4.1 4.1 5.4

2.        If the registrant demonstrates that the aluminum equiva- lent of the total filtration in the primary beam is not less than that shown in Table II, the registrant is considered to have met the criteria in subsection (C)(1).