**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: I_{1} and I_{2}. The I_{1} function is an integration of
a Gaussian function multiplied by the E_{1} 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 I_{1} and I_{2} 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.

**KEYWORDS: ** GAMMA-RAY; ENVIRONMENTAL DOSE; GAUSSIAN PLUME MODEL;
KERNEL; NUCLIDE TRANSPORT