Table 5-4. Dosimetric source organs for intakes of STC

DOE-HDBK-1184-2004

The first step in calculating He is to calculate the individual organ doses. To do this

we must know:

The source organs8;

The number of decays that take place in the source organs;

The target organs 9; and

The fraction of energy released in the source organs that is absorbed in a target

organ.

The source organs for STC are listed in Table 5-4.

Table 5-4. Dosimetric source organs for intakes of STC.

ET1sur bbseq

ET2sur

ET2seq LNth

LNet

UBcont

BBgel

BBsol

ULI

BBseq

LLI

bbsol

tissue

bbgel

The abbreviation "sur" refers to surface, "seq" refers to sequestered, "gel" refers to

material in the fast clearing mucus on top of the cilia, and "sol" refers to material in

the slow clearing solution between cilia. The source organ "tissue" is the soft

tissues of the body.

A source organ may be associated with more than one biokinetic compartment. For

example, the source organ ET1sur is composed of only the ET1 biokinetic

compartment, whereas the ET2sur source organ is composed of the ET2 and

transformed ET2 (TET2) biokinetic compartments. The "tissue" source organ is

composed of the OBT, HTO, and blood biokinetic compartments (see Appendix B).

The decays U that take place in the source organs are calculated by integrating the

retention function for the biokinetic compartments that compose the source organ.

Once the source organs and their associated biokinetic compartments are

specified, the target organs must be specified. The target organs for STC are listed

in Table 5-5.

The organs in which tritium will decay and release radiation.

The organs that absorb the radiation emitted by the source organs.