Section 459.582 - Therapeutic X-ray systems: Leakage radiation; diaphragms and beam-limiting devices1. When the tube is operated at its leakage technique factors, the leakage radiation must not exceed the value specified at the distance specified for the classification of that X-ray system.2. For systems of contact therapy, leakage radiation must not exceed 100 mR/hr at 5 centimeters from the tube housing and must meet the following standards: (a) In 0-150 kVp systems which are manufactured or installed prior to February 28, 1980, the leakage radiation must not exceed 1 R in 1 hour at 1 meter from the source.(b) In 0-150 kVp systems which are manufactured on or after February 28, 1980, the leakage radiation must not exceed 100 mR in 1 hour at 1 meter from the source.(c) In 151 to 999 kVp systems, the leakage radiation must not exceed 1 R in 1 hour at 1 meter from the source except systems that operate in excess of 500 kVp may have a leakage radiation at 1 meter from the source equivalent to the useful beam multiplied by a factor of 0.001.3. Permanent fixed diaphragms or cones used for collimating the useful beam must provide the same degree of protection as required by the tube housing assembly.4. Removable beam-limiting devices such as diaphragms or cones must, for the portion of the useful beam to be blocked by these devices, transmit not more than 1 percent of the original X-ray beam at the maximum kilovoltage and maximum treatment filter.5. Adjustable beam-limiting devices installed after February 28, 1980, must meet the criteria of subsection 4.6. Adjustable beam-limiting devices installed before February 28, 1980, must, for the portion of the X-ray beam to be blocked by these devices, transmit not more than 5 percent of the original X-ray beam at the maximum kilovoltage and maximum treatment filter.Nev. Admin. Code § 459.582
Bd. of Health, Radiation Control Reg. §§ 6.8-6.8.1.3.3, eff. 2-28-80