DHS 157.03(390)(390) “Transport index” or “TI” means the dimensionless number, rounded up to the next tenth, placed on the label of a package to designate the degree of control to be exercised by the carrier during transportation. The transport index is the number is determined by multiplying the maximum radiation level in millisievert (mSv) per hour at one meter (3.3 feet) from the external surface of the package by 100, which is equivalent to the maximum radiation level in millirem per hour at one meter (3.3 ft). DHS 157.03(391)(391) “Transuranic waste” means waste containing elements having an atomic number greater than 92, a half-life greater than 5 years and in quantities greater than 3.7 kBq/g (100 nCi/g). DHS 157.03(392)(392) “Treatment site” means the anatomical description of the tissue intended to receive a radiation dose, as described in a written directive. DHS 157.03(392m)(392m) “Tribal official” means the highest ranking individual that represents Tribal leadership, such as the Chief, President, or Tribal Council leadership. DHS 157.03(393)(393) “Tritium neutron generator target source” means a tritium target source used within a neutron generator tube to produce neutrons for use in well logging applications. DHS 157.03(393m)(393m) “Trustworthiness and reliability” means the characteristics of an individual considered dependable in judgment, character, and performance, such that unescorted access to category 1 or category 2 quantities of radioactive material by that individual does not constitute an unreasonable risk to the public health and safety or security. A determination of trustworthiness and reliability for this purpose is based upon the results from a background investigation. DHS 157.03(394)(394) “Tube housing assembly” means the tube housing with tube installed. It includes high-voltage, filament transformers and other appropriate elements which are contained within the tube housing. DHS 157.03(395)(395) “Tube” means an x-ray tube, unless otherwise specified. DHS 157.03(396)(396) “Type A package” means a packaging that, together with its radioactive contents limited to A1 or A2 as appropriate, meets the requirements of 49 CFR 173.410 and 173.412 and is designed to retain the integrity of containment and shielding required under normal conditions of transport as demonstrated by the tests set forth in 49 CFR 173.465 or 173.466, as appropriate. DHS 157.03(397)(397) “Type A quantity” means a quantity of radioactive material, the aggregate radioactivity of which does not exceed A1 for special form radioactive material or A2 for normal form radioactive material, where A1 and A2 are given in ch. DHS 157 Appendix O or may be determined by procedures described in ch. DHS 157 Appendix O. DHS 157.03(398)(398) “Type B package” means a packaging that, together with its radioactive contents, is designed to retain the integrity of containment and shielding required by 49 CFR 173 when subjected to the normal conditions of transport and hypothetical accident test conditions set forth in 10 CFR 71. DHS 157.03 NoteNote: A Type B package design is designated as B(U) or B(M). B(U) refers to the need for unilateral approval of international shipments; B(M) refers to the need for multilateral approval. No distinction is made in how packages with these designations may be used in domestic transportation. To determine their distinction for international transportation, refer to 49 CFR Part 173. A Type B package approved prior to September 6, 1983 was designated only as Type B. DHS 157.03(399)(399) “Type B quantity” means a quantity of radioactive material greater than a type A quantity. DHS 157.03(401)(401) “Underwater irradiator” means an irradiator in which the sources always remain shielded under water and humans do not have access to the sealed sources or the space subject to irradiation without entering the pool. DHS 157.03(402)(402) “Underwater radiography” means industrial radiography performed when the radiographic exposure device and related equipment are beneath the surface of the water. DHS 157.03(402g)(402g) “Unescorted access” means solitary access to a category 1 or category 2 quantity of radioactive material or the devices that contain the material. DHS 157.03(402m)(402m) “Unirradiated uranium” means uranium containing not more than 2 X 103 Bq of plutonium per gram of uranium-235, not more than 9 X 106 Bq of fission products per gram of uranium-235, and not more than 5 X 10-3 g of uranium-236 per gram of uranium-235. DHS 157.03(403)(403) “Unit dosage” means a quantity of radioactive material that meets all the following criteria: DHS 157.03(403)(b)(b) Is to be administered as a single dosage to a patient or human research subject without any further manipulation of the dosage after it is initially prepared, except to adjust the dosage to patient needs. DHS 157.03(404)(404) “Unrefined and unprocessed ore” means ore in its natural form prior to any processing, such as grinding, roasting or beneficiating, or refining the ore from its natural state. Processing does not include sieving or encapsulation of ore or preparation of samples for laboratory analysis. DHS 157.03(405)(405) “Unrestricted area” or “uncontrolled area” means an area, access to which is neither limited nor controlled by the licensee or registrant. DHS 157.03(406)(406) “Uranium sinker bar” means a weight containing depleted uranium used to pull a logging tool down toward the bottom of a well. DHS 157.03(407)(407) “Useful beam” means the radiation which passes through the tube housing port and the aperture of the beam-limiting device when the exposure switch or timer is activated. DHS 157.03(408)(408) “User seal check” means an action conducted by the respirator user to determine if the respirator is properly seated to the face. Examples include negative pressure check, positive pressure check, irritant smoke check, or isoamyl acetate check. DHS 157.03(409)(409) “Variable-aperture beam-limiting device” means a beam-limiting device that has capacity for stepless adjustment of the x-ray field size at a given SID. DHS 157.03(410)(410) “Very high radiation area” means an area, accessible to individuals, in which radiation levels from radiation sources external to the body could result in an individual receiving an absorbed dose in excess of 5 Gy (500 rad) in one hour at one meter from a source of radiation or one meter from any surface that the radiation penetrates. DHS 157.03(411)(411) “Virtual source” means a point from which radiation appears to originate.