RESUMO
The value of lymphography in the diagnosis of lymph node metastases was investigated in 89 patients with stage Ib cervical carcinoma. All patients underwent radical hysterectomy. The lymphography (radiological diagnosis) was compared with the histopathological examination of the corresponding lymph nodes. The positive predictive value of the lymphography was 13% and that of the negative predictive value 98%. It is concluded that lymphography is not reliable for the diagnosis of lymph node metastases in cervical cancer stage Ib.
Assuntos
Metástase Linfática/diagnóstico , Linfografia , Neoplasias do Colo do Útero/diagnóstico por imagem , Feminino , Humanos , Estadiamento de Neoplasias , Valor Preditivo dos Testes , Neoplasias do Colo do Útero/patologiaRESUMO
A high-statistics measurement of bremsstrahlung emitted in the alpha decay of (210)Po has been performed, which allows us to follow the photon spectra up to energies of approximately 500 keV. The measured differential emission probability is in good agreement with our theoretical results obtained within the quasiclassical approximation as well as with the exact quantum mechanical calculation. It is shown that, due to the small effective electric dipole charge of the radiating system, a significant interference between the electric dipole and quadrupole contributions occurs, which is altering substantially the angular correlation between the alpha particle and the emitted photon.
RESUMO
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin (nat)Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation gamma-ray yields the B(E2;0(+)gs-->2(+)1) value of 30Mg was determined to be 241(31)e2 fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope 30Mg resides outside the "island of inversion."