Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: nuclear reaction

Sortuj według:

Ogranicz wyniki do:

Nuclear reaction applied to fluorine depth profiles in human dental tissues

Torrisi Lorenzo

Polish Journal of Medical Physics and Engineering

2019

Vol. 25, Iss. 4

193--199

The nuclear reaction 19F(p, αγ)16O is presented as a valid method to measure the fluorine content in the first superficial layers of teeth. The analysis is performed in-vitro in extracted teeth, both healthy, fluorotic and decayed. It is performed irradiating the tooth with an energetic proton beam and analyzing the emitted high energy alpha particles. The quantitative analysis is performed comparing results with that of a standard sample at a known concentration. The depth profile of fluorine has a maximum content in the first superficial layers. The average concentrations in healthy enamel are of the order of 2 mg/g; it is of about 10 mg/g in fluorotic teeth, and below 0.1 mg/g in decayed teeth. The concentration in the dentine is about 50% lower than in the enamel and the concentrations decrease going from incisors to premolar and to molar teeth. Many results and a literature comparison are presented and discussed.

Chaos in the model atomic nuclei and other applications of quantum mechanics

Sveda Ρ., Kratochvil C.

Modelling and Optimization of Physical Systems

2011

z. 10

85--88

Quantum chaos was discovered in atomic nuclei, which influences the course of nuclear reactions. But it turned out that the quantum chaos occurs universally for a broad class of problems, for example, when analyzing the distribution of spectral lines in the optical, acoustic, microwave technology. And also quantum chaos is discussed in connection with the construction of quantum computers.

Kvantovy chaos byl objeven u atomovych jader, kde ovlivnuje prubeh jadernych reakci. Ovsem ukazalo se, ze kvantovy chaos se vyskytuje univerzalne u sirokych tfid problemu, napfiklad pfi analyze rozdeleni spektralnych car v optice, v akustice, v mikrovlnne technice. A o kvantovem chaosu se mluvi i v souvislosti s uvahami o konstrukci kvantovych pocitacu.