Determination of Dose Rates from Beta Transmission Currents

1960 ◽  
Vol 31 (10) ◽  
pp. 1826-1826
Author(s):  
Arthur Bradley
Keyword(s):  
Dose Rates

scholarly journals Analysis of the 40K levels in soil using gamma spectrometry

2005 ◽  
Vol 48 (spe2) ◽  
pp. 221-228 ◽  
Author(s):  
José Araújo dos Santos Júnior ◽  
Jorge João Ricardo Ferreira Cardoso ◽  
Cleomacio Miguel da Silva ◽  
Suêldo Vita Silveira ◽  
Romilton dos Santos Amaral
Keyword(s):  
Gamma Spectrometry ◽  
Absorbed Dose ◽  
Soil Samples ◽  
Spectrometry Method ◽  
Dose Rates ◽  
Elemental Concentrations ◽  
High Purity Germanium ◽  
Specific Activities ◽  
Potassium 40

Potassium-40 was determined in soil in an area with 40,000 m² situated in the western State of Pernambuco, Brazil. For radiometric measurements, the gamma spectrometry method with a high purity germanium (HPGe) detector was used. Sampling of 78 soil samples has been performed at intervals of 25 m. The specific activities of 40K were calculated based on the photopeak of 1.46 MeV. Values from 541 to 3,572 Bq kg-1 were obtained (mean of 1,827 Bq kg-1). These values allowed the determination of the elemental concentrations as well as the absorbed dose rates in air, 1 m above the ground. The values varied from 1.7 to 11.5% (mean of 6%) and from 23.4 to 154.3 nGy h-1 (mean of 79 nGy h-1), respectively.

Determination of dose rates from natural radionuclides in dental materials

2006 ◽  
Vol 91 (1-2) ◽  
pp. 15-26 ◽  
Author(s):  
I. Veronese ◽  
G. Guzzi ◽  
A. Giussani ◽  
M.C. Cantone ◽  
D. Ripamonti
Keyword(s):  
Natural Radionuclides ◽  
Dental Materials ◽  
Dose Rates

Thermoluminescence as a potential means of dating siliceous ocean sediments

1976 ◽  
Vol 13 (4) ◽  
pp. 593-596 ◽  
Author(s):  
D. J. Huntley ◽  
H. P. Johnson
Keyword(s):  
Radiation Dose ◽  
North Pacific ◽  
Deep Sea ◽  
Radiation Sensitivity ◽  
Single Peak ◽  
Dose Rates ◽  
Thermoluminescence Dating ◽  
Limiting Value

The natural thermoluminescence of siliceous shell separated from two North Pacific deep-sea cores has been measured. The thermoluminescence shows a single peak at ~240 °C, the intensity of which increases with depth up to a limiting value. Measurements of sample radiation-sensitivity and the determination of radiation dose rates are also presented. It is concluded that thermoluminescence dating is a potentially viable dating technique for such material.

scholarly journals Calibration of spectrometric detectors for air kerma rates in environmental monitoring

2020 ◽  
Vol 35 (4) ◽  
pp. 323-330
Author(s):  
Marcel Ohera ◽  
Daniel Sas ◽  
Petr Sladek
Keyword(s):  
Monte Carlo Simulation ◽  
Hpge Detector ◽  
Absorbed Energy ◽  
Dose Rates ◽  
Ion Chamber ◽  
Air Kerma ◽  
Hpge Detectors ◽  
Different Types ◽  
Plastic Detector

The spectrometric systems, especially based on NaI(Tl) and HPGe detectors, are used for nuclide identification and calculation of their activities from the ground measurements and air-borne monitoring. The determination of the air kerma (dose) rates is also very important for environmental measurements. In such cases, the detectors should be calibrated for air kerma (dose) rates in nGyh?1 or ?Gyh?1. A simple calibration of NaI(Tl), HPGe as well as plastic detectors for the low-level air kerma rates is presented in this contribution. This calibration is based on comparing the relative absorbed energy rate in detectors (MeVs?1) calculated from spectra with the air kerma rates calculated by the Monte Carlo simulation and supplementary to the data from the RSS Reuter&Stokes high pressure ion chamber. This method also eliminates the conversion from the non-air kerma rates in crystals to the air kerma rates. Three different types of small cylindrical detectors were calibrated for the air kerma rates from the background of 26 nGyh?1 to some tens of ?Gyh?1 in the energy range to the maximum of 3 MeV. The results of calibrations of the 3" x 3" NaI(Tl), HPGe detector and a small plastic detector (made of polystyrene) including soxme examples of environmental measurements are presented.

URINARY EXCRETION OF FREE CORTISOL IN IMPAIRED RENAL FUNCTION

1975 ◽  
Vol 78 (1) ◽  
pp. 86-90 ◽  
Author(s):  
P. Sederberg-Olsen ◽  
C. Binder ◽  
H. Kehlet
Keyword(s):  
Renal Function ◽  
Urinary Excretion ◽  
Impaired Renal Function ◽  
Filtration Rate ◽  
Urinary Cortisol ◽  
Dose Rates ◽  
Total Cortisol ◽  
Free Cortisol ◽  
Free Urinary Cortisol

ABSTRACT Total cortisol and free, non protein-bound cortisol in plasma and urinary excretion of unconjugated free cortisol were measured during iv infusion of cortisol at varying dose rates in eight patients with impaired renal function. The results showed that free urinary cortisol decreased with decreased glomerular filtration rate (GFR), also compared to free cortisol level in plasma. An increase in free cortisol in plasma had no influence on GFR. It is concluded that determination of free urinary cortisol, otherwise useful in diagnosing Cushing's syndrome, may be of less value in patients with impaired renal function.

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