Oral Biology Research

Table. 2.

TLDs used to calculate the absorbed dose of tissue, fraction ratio of tissue/organ exposed to radiation (fraction irradiated), tissue weighting factors (WT), and equivalent dose (HT) used to calculate the effective dose

Tissue/organ TLD ID Fraction irradiated WT HT Effective dose calculation
Bone marrow 16.5% 0.12 3.0
Mandible 13, 14, 17, 18 1.3% 352.3
Calvaria 1, 2, 3 11.8% 12.7
Cervical spine 15 3.4% 566.3
Thyroid 22, 23 100.0% 0.04 53.6 2.1
Esophagus 24 10.0% 0.04 102.7 0.4
Skin 6, 7, 10, 16 11.0% 0.01 95.9 0.1
Bone surfacea 16.5% 0.01 1.0
Mandible 13, 14, 17, 18 1.3% 1429.3
Calvaria 1, 2, 3 11.8% 51.7
Cervical spine 15 3.4% 2297.1
Salivary glands 100.0% 0.01 8.2
Parotid 11, 12 1821.6
Submandibular 19, 20 423.5
sub-lingual 21 213.0
Brain 4, 5 100.0% 0.01 25.0 0.2
Remainder 0.12 13.2
Lymphatic nodes 11-15, 17-22, 24 40.0% 571.0
Muscle 11-15, 17-22, 24 5.0% 571.0
Extrathoracic airway 8, 9, 11-15, 17-22, 24 100.0% 491.4
Oral mucosa 11-14, 17-21 100.0% 679.2
Effective dose 28.4

TLD, thermoluminescence dosimeter.

aBone surface dose=bone marrow dose×bone/muscle mass energy absorption coefficient ratio (MEACR). MEACR=–0.0618×2/3 kV peak+6.9406 using data taken from National Bureau of Standards handbook no. 85 [14].

Oral Biol Res 2021;45:22~28 https://doi.org/10.21851/obr.45.01.202103.22
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