Evaluation of Radiological Hazards associated with some selected mining sites (ie Gadaeragi (GR), Maiwayo (MW) and Kataeragi (KR)) in Niger State, Nigeria was carried out using Nal (TI) Gamma ray spectroscopy. The results shows average activity concentration for 238U, 232Th, 40K site are 8.05 ± 0.14 Bq/kg, 14.60 0.30 Bq/kg 20.62 14.62 respectively. result 232Th to be 12.03 0.17 17.89 0.32 151.1...

A new route has been investigated for the production of the Rb(Kr) generator parent radionuclide at low energy cyclotrons. The excitation function of the Kr(d,n)Rb reaction was measured up to 14 MeV using natural Kr gas as target, the activation method and a stacked gas-cell irradiation technique. The saturation yield of Rb over the energy range Ed 5 14 → 6 MeV amounts to 2.86 GBq/μA. A compari...

Selective exotat~on of Kr atoms at the surface of sohd Ar with synchrotron radlatton stimulates the desorptlon of excited Kr atoms (e g., Kr3P1) as well as the luminescence of Kr-type surface centers at hv = 9 998 eV (3P 1) and at hv = 9.881 eV (3P 2) The high-resolution luminescence spectra and the yield curves of the radiative decay channels have been measured. They are interpreted taking int...

Weakly-bound atoms and molecules (Ar, Kr, Xe, CO, CH4, CO2, CH3OH, N2O, and N2) are used to probe the photochemical interactions of chemisorbed oxygen on rutile TiO2(110). Ultraviolet irradiation of chemisorbed oxygen co-adsorbed with the probe species leads to photon-stimulated desorption (PSD) of some of the probe species (e.g. Kr and CH4), but not others (e.g. CO2 and N2O). Without chemisorb...

We present successful (81)Kr-Kr radiometric dating of ancient polar ice. Krypton was extracted from the air bubbles in four ∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The (81)Kr radiometric ages agree with independent age estimates obtained from stratigraphic dating techniques with a mean absolute age of...

Crop evapotranspiration (ET) is a fundamental component of the hydrological cycle, especially in arid/semi-arid regions. The FAO-56 offers an operational method for deriving ET from reduction (dual crop coefficient Kc) atmospheric evaporative demand (ET0). dual approach (FAO-2Kc) intended to improve daily estimation by separating contribution bare soil evaporation (E) and transpiration componen...

OBJECTIVE The purpose of this research was to investigate the anti-angiogenic inhibitory effect of KR-31831, a newly developed anti-angiogenic agent, on an in vivo human ovarian carcinoma model using dynamic contrast-enhanced (DCE) MRI. MATERIALS AND METHODS Xenografted ovarian tumors were established by subcutaneous injection of SKOV3 cells into mice. The mice were treated daily with KR-3183...

Hyperpolarized (hp) Kr (spin I = 9/2) is a promising gas-phase contrast agent that displays sensitivity to the surface chemistry, surface-to-volume ratio, and surface temperature of the surrounding environment. This proof-of-principle study demonstrates the feasibility of ex vivo hp Kr magnetic resonance imaging (MRI) of lungs using natural abundance krypton gas (11.5% Kr) and excised, but othe...