DHS 157.03(383)(383) “Thermoluminescent dosimeter” or “TLD” means a dosimeter containing a crystalline solid for measuring radiation dose, plus filters to help characterize the types of radiation encountered. When heated, TLD crystals that have been exposed to ionizing radiation give off light proportional to the energy they received from the radiation. DHS 157.03(384)(384) “Tight-fitting facepiece” means a respiratory inlet covering that forms a complete seal with the face. DHS 157.03(385)(385) “Tomogram” means the depiction of the x-ray attenuation properties of a section through the body. DHS 157.03(386)(386) “Tomographic plane” means that geometric plane which is identified as corresponding to the output tomogram. DHS 157.03(387)(387) “Tomographic section” means the volume of an object whose x-ray attenuation properties are imaged in a tomogram. DHS 157.03(388)(388) “Total effective dose equivalent” or “TEDE” means the sum of the effective dose equivalent for external exposures and the committed effective dose equivalent for internal exposures. DHS 157.03(389)(389) “Total organ dose equivalent” or “TODE” means the sum of the deep dose equivalent and the committed dose equivalent to the organ receiving the highest dose. 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.