1. NAME AND TITLE

DINT-YAEC: Evaluator of I1 and I2 Integrals as Used in Long-Term External Gamma-Ray Doses from Routine Atmospheric Releases.

2. CONTRIBUTOR

Yankee Atomic Electric Company, Westborough, Massachusetts.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370 and CDC.

4. NATURE OF PROBLEM SOLVED

The gamma-ray dose in air from a sector-averaged plume may be expressed as a product of several factors multiplied by a sum of two attenuation integrals: I₁ and I₂. The I₁ function is an integration of a Gaussian function multiplied by the E₁ exponential integral. The _I2 function is an integration of a Gaussian function multiplied by an exponential.

5. METHOD OF SOLUTION

The integrals are evaluated numerically.

6. RESTRICTIONS OR LIMITATIONS

Double precision is required for IBM machines.

7. TYPICAL RUNNING TIME

DINT is meant to be used as a subroutine. Typical CDC running time is a few msecs per call.

8. COMPUTER HARDWARE REQUIREMENTS

DINT is operable on an IBM 360/370 or a CDC computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required.

10. REFERENCE

J. N. Hamawi, "A Method for Computing the Gamma-Dose Integrals I₁ and I₂ for the Finite-Cloud Sector-Average Model," YAEC-1105 (April 1976).

U.S. Nuclear Regulatory Commission Regulatory Guide 1.109, "Calculation of Annual Doses to Man from Routine Releases if Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50," Appendix I, Revision 1 (October 1977).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

December 1981; revised March 1989.