The main objective of this website is to make available scientific articles written by Eduardo J. C. Martinho, José F. Salgado and Isabel Maria F. Gonçalves, from the Instituto Tecnológico e Nuclear, Sacavém, Portugal.

The research, published between 2001 and 2004, was about a relevant phenomenon in reactor and neutron physics called *neutron self-shielding*, which comprises *resonance neutron self-shielding* (G_{res}) and *thermal neutron self-shielding* (G_{th}). The practical importance of our work resides in the final conclusion that the phenomenon can be quantified by a *universal law* of G_{res }and G_{th} for foils, wires, spheres and cylinders.

*Neutron flux profile resulting from the self-shielding effect in a sample*

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The innovation of our final results has been summarized by a Canadian team***** as follows:

**«**(…) *Historically, the calculation of* G_{th} *and* G_{ep} [or G_{res}] *was extremely difficult, and it was recommended to dilute the samples to avoid self-shielding*. ** Fortunately, reactor physicists recently showed that the amount of epithermal as well as thermal self-shielding could be expressed by the same analytical function, a sigmoid, for all nuclides **[

**2–4**]

******. (…)

**»**

*** **C. Chilian, R. Chambon, G. Kennedy: *Neutron self-shielding with* *k*_{0}–*NAA irradiations.* Nuclear Instruments and Methods in Physics Research **A** 622 (2) (2010) 429-432].

****** CITED REFERENCES:

[**2**] E. Martinho, I.F. Gonçalves, J. Salgado*, **Universal curve of epithermal neutron resonance self-shielding factors in foils, wires and spheres**.* Applied Radiation and Isotopes 58(3) (2003) 371-375;

[**3**] I.F. Gonçalves, E. Martinho, J. Salgado, *Extension to cylindrical samples of the universal curve of resonance neutron self-shielding factors*. Nuclear Instruments and Methods in Physics Research B 213 (2004) 186-188;

[**4**] E. Martinho, J. Salgado, I.F. Gonçalves, *Universal curve of thermal neutron self-shielding factors in foils, wires, spheres and cylinders*. Journal of Radioanalytical and Nuclear Chemistry 261 (3) (2004) 637-643.

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Scientists from ** several countries** [Algeria, Argentina, Australia, Austria, Bangladesh, Belgium, Brazil, Bulgaria, Canada, Chile, China, Cuba, Denmark, Egypt, France, Germany, Greece, Hungary, India, Indonesia, Iran, Italy, Japan, Kazakhstan, Malaysia, Mexico, Pakistan, Peru, Portugal, Romania, Slovenia, South Korea, Switzerland, Taiwan, The Netherlands, Turkey, United Kingdom, United States of America, Uzbekistan and Vietnam] and

**[Joint Research Centre/EU (Geel, Petten, Ispra) and International Atomic Energy Agency (Vienna)] are using our results in works related to various domains, namely reactor neutron metrology, determination of nuclear parameters (thermal neutron cross-sections and resonance integrals), neutron activation analysis, production of radioisotopes for medical applications.**

*international institutions***CITATIONS****: **http://tempoderecordar-edmartinho.blogspot.pt/2015/11/neutron-self-shielding-citations.html

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**CONTENTS:**

https://edmartinho.files.wordpress.com/2010/03/**04**-2003–**universal-curve-of-resonance-neutron-self-shielding-factors-foils-wires-spheres.pdf**

https://edmartinho.files.wordpress.com/2010/03/**05**-2004-**extension-of-universal-curve-of-resonance-neutron-self-shielding-factors-to-cylindrical-samples.pdf**

https://edmartinho.files.wordpress.com/2010/03/**09**-2004-**universal-curve-of-thermal-neutron-self-shielding-factors-foils-wires-spheres-cylinders.pdf**

https://edmartinho.wordpress.com/2010/08/29/**universal-curves-of-gres-and-gth/**

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edmartinho@gmail.com