MicroSkyshine® calculates the photon dose from sky scattered gamma ray radiation.

MicroSkyshine® has been used to evaluate conformance with:

• 10CFR50, Appendix I ALARA requirements
• 40CFR190 fuel cycle exposure criteria.

Typical application would be to determine scattering from BWR turbine buildings, radwaste storage facilities, and waste disposal sites.

MicroSkyshine's® analytical method of solution is based on the use of “beam functions” for a point source. This method was developed for NUREG/CR-0781 (May 1979), which resulted from an NRC sponsored effort. However, MicroSkyshine® reflects the efforts of analysts at Kansas State University, who further improved the method. 

MicroSkyshine's® Technical Features:

1. A variety of silo and wall geometries. MicroSkyshine® accepts dimensional data in meters, centimeters, feet, or inches.
2. The scattering medium is air, and the Berger method is used for calculating buildup in an overhead shield. Any one of seven materials can be selected for this purpose.
3. Library data for radionuclides, attenuation, and buildup are included.
4. Source decay can be calculated and daughters generated.
5. As many as twenty energy groups (with an energy range of 100 keV-10 MeV) may be created; total concentration entries are automatically converted to curies.
6. All calculations performed by MicroSkyshine® assume that the silo wall or vertical wall is a perfect shield; that is, radiation through the walls will not be calculated.

Geometries Included:

• Point Source In A Silo
• Vertical Line Source In A Silo
• Vertical Cylinder Source In A Silo
• Point Source Behind A Wall
• Horizontal Line Source Behind A Wall
• Horizontal Rectangular Area Source Behind A Wall
• Horizontal Circular Area Source Behind A Wall
• Vertical Line Source Behind A Wall
• Vertical Rectangular Area Source Behind A Wall
• Vertical Circular Area  Source Behind A Wall
• Rectangular Volume Source Behind A Wall
• Vertical Cylindrical Volume Source Behind A Wall
• Horizontal Cylindrical Source Behind A Wall
• Point Source In A Rectangular Enclosure

MicroSkyshine® Enhanced Software Features:

1. Microsoft Windows interface.
2. Fully interactive input processing and input error checking.
3. The main menu allows you to create, save, load, erase, and run many cases. You can change one data entry without having to pass through the entire input sequence.
4. Batch Processing - Multiple cases can be run in Batch mode
5. Sensivity Runs - Several parameters can be examines to determine the resulting dose rate.
6. Results can be saved in text, HTML, Microsoft Word, and Excel formats.

Requirements:

• Microsoft Windows 2000 / XP
• Microsoft .Net Framework Version 1.1
• Microsoft Word 2003 and Excel 2003 (for saving results to these formats)

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