Computer code was developed to determine radioactive emission rates of nuclear fuels. Code is basically written for two different source geometries; however, unfolding routine can be executed for other source geometries

Taherzadeh, M.

English

NASA Technical Reports Server

March 1973	 B73-10087 
NASA TECH BRIEF 
•	 NASA Pasadena Office 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
PPUAS - Photopeak Unfolding and Self-Shielding Program 
LU
The problem: 
A method was needed for determining radioactive 
emission rates of nuclear fuels. 
The solution: 
A computer code labeled PPUAS (Photopeak Un-
folding And Self-Shielding) was developed for determi-
nation of the photon emission rate. 
How it's done: 
The emission rate of a Pu0 2
 nuclear fuel was 
obtained by using an experimentally measured pulse 
height distribution of a Ge (Li) Detector. The input data 
to the program consist of the geometry and character-
istics of the specially selected radiation source and the 
detector. The output data consist of the photon flux at a 
specified distance from the source, the original un-
scat Lered photonic line spectrum of the source, and the 
self-shielding characteristic of the fuel.
The code is basically written for two different source 
geometries; however, the unfolding routine can be 
executed for other source geometries, provided the self-
shielding parameter of the fuel is utilized as input data. 
Notes: 
1. This program was written in FORTRAN V for use on 
a UNIVAC-i 108 computer and will be disseminated 
as a card deck or as an IBM-generated tape. 
2. Inquiries concerning this program should be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: NPO-13188 
Source: M. Taherzadeh of

Caltech/JPL
under contract to

NASA Pasadena Office

(NPO-13188) 
Category 09, 03 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
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PPUAS--photopeak unfolding and self-shielding program

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