1. NAME AND TITLE
INDOS: Conversational Computer Code Systems to Implement ICRP-10-10A Models for
Estimation of Internal Radiation Dose to Man.
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
3. CODING LANGUAGE AND COMPUTER
FORTRAN IV; PDP-10.
4. NATURE OF PROBLEM SOLVED
INDOS computes, as functions of time, the radiation dose rate and dose to an organ of the body of Reference Man resulting from a deposition in the organ of a specified quantity of any one of a number of radionuclides. The models employed are essentially those of Publications 10 and 10A of the International Commission on Radiological Protection (ICRP); the three basic models assume excretion rates which are, respectively, (1) exponential, (2) power function, and (3) a combination of the two. The two patterns of intake simulated are as follows:
INDOS 1 depends entirely on input by the user, whereas INDOS2 and INDOS3 access on-line
data-base files for parameter values associated with the radionuclide and organ under study.
INDOS1 provides only tabular output of dose rate (rems/day) and dose (rems) as functions of time.
INDOS2 offers the foregoing tabulation and graphs of dose vs time. INDOS3 gives only punched-card output of organ burden and dose as functions of time. INDOS2 and INDOS3 consider two
modes on intake; inhalation and ingestion.
5. METHOD OF SOLUTION
Routine evaluations of closed-form solutions of the differential equations which define the models are used. The power-function models require the calculation of integrals. Standard numerical methods are employed to approximate these integrals. Any portion of the range of integration beyond t = 65 is truncated and an asterisk is printed in the table to signal such truncation.
In general, if the input data and parameter values are assumed exact, six-significant-digit
accuracy is believed to be obtained when the supporting machine precision is eight decimal digits.
6. RESTRICTIONS OR LIMITATIONS
User-entered inputs are checked for gross errors (e.g., negative or zero values of quantities that must be positive). When such are detected, a message is typed, and the user is given the opportunity to enter corrected information. No checking of information read from the direct-access data-base file (INDOS2 and INDOS3) is done.
The user is not protected from the accidental specification of an excessive number of lines of tabulation (INDOS1 and INDOS2).
The INDOS codes have been prepared and tested with the general assumption that time ranges
covered by the simulations do not exceed 18,250 days; there are, however, no inherent limitations
which preclude longer ranges.
7. TYPICAL RUNNING TIME
INDOS runs in approximately 2 minutes.
8. COMPUTER HARDWARE REQUIREMENTS
INDOS runs on the PDP-10 computer.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN IV compiler is required.
G. G. Killough and P. S. Rohwer, "INDOSConversational Computer Codes to Implement
ICRP-10-10A Models for Estimation of Internal Radiation Dose to Man," ORNL-4916 (March
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents and one (1.2MB) DOS diskette which contains the
source code and sample problem input.
12. DATE OF ABSTRACT
August 1975; reviewed February 1983.
KEYWORDS: GAMMA-RAY; ON-LINE; INTERNAL DOSE