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(vi) x-rays;

(41) “ionizing radiation area” means an area that is accessible to an individual in which there exists ionizing radiation at a level that a major portion of the individual’s body may receive a dose in excess of five millirems in an hour period of time or a dose in excess of 100 millirems in a five consecutive day period;

(42) “ionizing radiation source” means a device capable of producing ionizing radiation;

(43) “kilovolts peak” means the crest value of kilovolts of the potential of a pulsating potential generator and, when only one-half of the wave is used, the value refers to the useful half of the wave;

(44) “lens dose equivalent” means the external exposure to the lens of the eye, measured as the dose equivalent at a tissue depth of 0.3 centimeter;

(45) “lead equivalent” means the thickness of lead, under specified conditions, that allows the same attenuation as the material in question;

(46) “leakage radiation” means radiation emitted from an enclosure, except for the useful beam;

(47) “limits” or “dose limits” means the upper bounds of radiation doses permitted under this chapter;

(48) “medical” means related to a practice engaged in by a practitioner of the healing arts licensed by this state;

(49) “microcurie” means one millionth of a curie or 3.7 x 107 disintegrations per second;

(50) “millisievert” means one-thousandth of a sievert;

(51) “minor” means an individual less than 18 years of age;

(52) “NVLAP” means National Voluntary Laboratory Accreditation Program; a sub-department of the National Institute of Standards and Technology (NIST), Standard Services Division;

(53) “nonstochastic effect”

(A) means a health effect that occurs only after a minimum threshold exposure to radiation, the severity of which varies with the dose;

(B) includes radiation-induced cataract formation;

(54) “occupational dose”

(A) means the dose received by an individual in the course of employment in which the individual’s assigned duties involve exposure to radiation or to radioactive material, whether in the possession of the registrant or other person;