# 4.4.1. Radiation

This section discusses defining radiation boundary conditions whose formulations depend upon the Stefan Boltzmann constant. Provision is made for all radiation BC models to access a single value of the constant from command reference.

- 4.4.1.1. Enclosure Radiation
  - 4.4.1.1.1. Partial Enclosures
  - 4.4.1.1.2. Banded Wavelength Model
  - 4.4.1.1.3. Dash Enclosures
- 4.4.1.2. SPn Radiation
- 4.4.1.3. MPMD Radiation
  - 4.4.1.3.1. Aria Input Deck
  - 4.4.1.3.2. PMR Input Deck
- 4.4.1.4. Ray Tracing
  - 4.4.1.4.1. Banded Radiation