RSICC CODE PACKAGE CCC-722

1. NAME AND TITLE

NAAPRO Neutron Activation Analysis PRognosis and Optimization Code System.

2. CONTRIBUTOR

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine.

3. CODING LANGUAGE AND COMPUTER

C++; Windows 9x, 2000, XPC on PC (C722PC58600).

4. NATURE OF PROBLEM SOLVED

NAAPRO predicts the results and main characteristics (detection limits, determination limits, measurement limits and relative precision of the analysis) of neutron activation analysis (instrumental and radiochemical). Gamma-ray dose rates for different points of time after sample irradiation and input count rate of the spectrometry system are also predicted. The code uses standard Windows user interface and extensive graphical tools for the visualization of the spectrometer characteristics (efficiency, response and background) and simulated spectrum. Optimization part is not included in the current version of the code. This release is designated NAAPRO, Version 01.beta.

The MCNP code was used for generating detector responses. PREPRO-2000 and FCONV programs were used at the preparation of the program nuclear databases. A special program was developed for viewing, editing and updating of the program databases (not included into the present program package). The MCNP, PREPRO-2000 and FCONV software packages are not included in the NAAPRO package.

5. METHOD OF SOLUTION

NAAPRO simulates gamma-ray spectrum of activation products for the specified analysis conditions. These are analysis time mode, analyzed sample mass and elemental composition, characteristics of irradiating neutron flux and irradiation conditions, gamma-spectrometry measurement geometry and background conditions, as well as detector and spectrometry system parameters. During calculation of gamma-ray yields of activation products the burnup and buildup of both radioactive and stable isotopes are taken into account.

6. RESTRICTIONS OR LIMITATIONS

Neutron self-shielding and gamma-ray self-absorption effects are neglected. Epithermal activation is calculated using infinite dilution resonance integrals with minimum energy 0.1 eV and 0.55 eV for irradiation without and with Cd shielding respectively. It is assumed that radiochemical separation is carried out just after the sample irradiation and it takes negligible time. The detector response is simulated assuming point source at the detector axis, neglecting by pile-up and true-coincidence

summing effects, using zero-dead-time approximation and simplified backscatter-peak model.

7. TYPICAL RUNNING TIME

The execution time varies from less than 1 second (single element sample) to approximately 60 seconds (multi-element sample) on a CPU Pentium 1 GHz.

8. COMPUTER HARDWARE REQUIREMENTS

The included executable runs on Windows2000 or WindowsXP. RAM 16 MB. Program installation requires 21 MB free hard disk space. Recommended CPU is a Pentium or compatible, frequency - 500 MHz and more.

9. COMPUTER SOFTWARE REQUIREMENTS

No source files are included in the package. The included NAAPRO executable was built with Borland C++ Builder 6 compiler and runs under Windows 9x, 2000, or XP on personal computers. NAAPRO was tested at RSICC on a Pentium IV 2.8 GHz running Windows XP with Service Pack 1.0.

10. REFERENCES

Included in RSICC document C722.PDF:

V. K. Basenko, A. N. Berlizov, R. H. Filby, I. A. Malyuk, and V. V. Tryshyn, "NAAPRO: Neutron Activation Analysis Prognosis and Optimization, Version 01.beta, User's Guide," NAAPRO-V01b_User_Guide.pdf (May 11, 2004).

V. K. Basenko, A. N. Berlizov, R. H. Filby, I. A. Malyuk, and V. V. Tryshyn, "NAAPRO: Neutron Activation Analysis Prognosis and Optimization, Version 01.beta, Model Description," NAAPRO-V01b_Model_Description.pdf (May 10, 2004).

V. K. Basenko, A. N. Berlizov, R. H. Filby, I. A. Malyuk, and V. V. Tryshyn, "NAAPRO Booklet," NAAPRO_Booklet.doc, Distributed at Modern Trends in Activation Analysis - 11, 20th-25th June 2004, University of Surrey, Guildford, UK (June, 2004).

11. CONTENTS OF CODE PACKAGE

NAAPRO is transmitted on CD-ROM. Included are the package is the reference documents along with test cases, and the pc executable. No source files are included with the package.

12. DATE OF ABSTRACT

August 2004.

KEYWORDS: ACTIVATION; NEUTRON; GAMMA-RAY SPECTRA ANALYSIS; GERMANIUM (Ge(Li)) DETECTOR