CCC-0273 DACRIN.

1. NAME OR DESIGNATION OF PROGRAM:  DACRIN.

3. DESCRIPTION OF PROBLEM OR FUNCTION

DACRIN is designed to provide rapid and consistent estimates of the effective radiation dose to the human respiratory tract and other organs resulting from the inhalation of radioactive aerosols. The program will calculate the effective radiation dose to any of 18 organs and tissues from inhalation of any one or a combination of radionuclides considered by the International Commission on Radiological Protection (ICRP). Input to the program consists of a few program control variables, the duration of inhalation exposure, ventilation rate, the time interval within which the dose is delivered, the organs of interest, the quantity of the radionuclide inhaled, its solubility class and particle size, and, when an atmospheric dispersion model is invoked, the additional parameters required for the model selected. Output provided by DACRIN consists of the effective radiation dose to the specified organs at selected time intervals for each radionuclide inhaled as indicated by the input data.

4. METHOD OF SOLUTION

The program is an outgrowth of the development  of a mathematical model for the organ dose following the basic precepts of the ICRP Task Group on Lung Dynamics, and a simple exponential model for retention by a organ of interest. As an adjunct to the organ dose model, mathematical models describing atmospheric dispersion have been included to evaluate doses from either accidental or chronic atmospheric releases of radionuclides.
The model divides the respiratory tract into three regions, the nasopharyngeal, the tracheobronchial, and the pulmonary. Deposition  is assumed to vary with the aerodynamic properties of the aerosol distribution. Atmospheric dispersion is described by a bivariate normal distribution model incorporated in the code; however, normalized air concentrations at specific distances as calculated by any other atmospheric dispersion model can be used as input.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   10 downwind distances at which dose is calculates
   10 organs
   10 time intervals measured from the most recent intake
    5 multiple intake intervals

6. TYPICAL RUNNING TIME

NESC compiled the DACRIN source and executed  the sample problem in 100 seconds of CP time on a UNIVAC1100/44.
NEA-DB executed the test case on UNIVAC 1100 in 20 CPU seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

Other programs which calculate organ dose include: SUBDOSA (NESC Abstract 924), which calculates external doses from atmospheric releases of radionuclides, AERIN (NESC Abstract 908), which calculates organ and tissue burdens resulting from acute exposure to a radioactive aerosol, and ARRRG,FOOD (NESC Abstract 925) and PABLM (NESC Abstract 926), which  calculate radiation doses to humans from radionuclides in the environment.

10. REFERENCES

- J.R. Houston, D.L. Strenge, and E.C. Watson,
  DACRIN, NESC No. 923.1100, DACRIN Tape Description and Errata to
BNWL-B-389, National Energy Software Center Note 81-80, August 28,    1981.

- J.R. Houston, D.L. Strenge and E.C. Watson:
  DACRIN - A Computer Program for Calculation Organ Dose from
  Chronic Radionuclide Inhalation. BNWL-B-389 (UC-41) Reissued
  (April 1976) + Errata (December 1977).

11. MACHINE REQUIREMENTS

56,000 words of memory are needed to execute  the program.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  EXEC 8.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

This
program should be compiled with the ASCII FORTRAN (FTN) compiler.

15. NAME AND ESTABLISHMENT OF AUTHOR

             J.R. Houston, D.L. Strenge*, and E.C. Watson
             Ecological Sciences Department
             Pacific Northwest Laboratories
             Battelle
             P.O. Box 999
             Richland, Washington 99352
* Contact

File name	File description	Records
CCC0273_01.003	DACRIN INFORMATION FILE	54
CCC0273_01.004	DACRIN SOURCE CARD IMAGES (FORTRAN-4)	2098
CCC0273_01.005	DACRIN JCL FOR TEST CASE EXECUTION	12
CCC0273_01.006	DACRIN INPUT DATA FOR TEST CASE	56
CCC0273_01.007	RMDLIB LIBRARY (FORMATTED, UNIT 10)	286
CCC0273_01.008	ORGLIB LIBRARY (FORMATTED, UNIT 11)	1994
CCC0273_01.009	DACRIN OUTPUT OF TEST CASE	2734