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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response...
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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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Outdoor dose rate mapping in Kuwait.

Darwish Al-Azmi1

  • 1Department of Applied Sciences, College of Technological Studies, Public Authority for Applied Education and Training, Shuwaikh, P.O.Box 42325, Code 70654, Kuwait.

Journal of Environmental Radioactivity
|January 23, 2017
PubMed
Summary
This summary is machine-generated.

Ambient outdoor gamma-ray dose rates were measured across Kuwait. The study found dose rates ranging from 31 to 59 nSv/h, with a mean of 46.5 nSv/h, and no detected 137Cs.

Keywords:
KuwaitNaI dosimeterOutdoor gamma dose rateScintillation energy spectra

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Area of Science:

  • Environmental radioactivity monitoring
  • Radiological assessment
  • Nuclear geophysics

Background:

  • Establishing a baseline for ambient gamma dose rates is crucial for environmental monitoring.
  • Previous comprehensive surveys of outdoor gamma dose rates in Kuwait were limited.
  • Understanding natural radionuclide distribution is key to assessing radiological impact.

Purpose of the Study:

  • To establish a baseline database for ambient outdoor gamma-ray dose rates in Kuwait.
  • To assess the in-situ contribution of primordial radionuclides and 137Cs to dose rates.
  • To evaluate the effectiveness of NaI-based dosimeters for environmental surveys.

Main Methods:

  • Conducted a country-wide survey of ambient outdoor gamma-ray dose rates at 112 locations in Kuwait.
  • Utilized a NaI (thallium-activated sodium iodide) dosimeter/spectrometer for in-situ measurements from August 2013 to March 2016.
  • Collected soil samples for laboratory gamma spectrometric analysis to complement in-situ data.

Main Results:

  • Measured gamma dose rates varied between 31 and 59 nSv/h, with a mean value of 46.5 nSv/h.
  • Primordial radionuclides showed normal relative contributions to the dose rates across all surveyed locations.
  • Cesium-137 (137Cs) was not detected in the outdoor environment of the investigated areas.

Conclusions:

  • The established gamma dose rate baseline provides essential data for Kuwait's environmental radioactivity monitoring.
  • The survey confirmed the absence of significant anthropogenic radionuclide (137Cs) contamination in Kuwait's outdoor environment.
  • NaI-based dosimeters proved effective for in-situ gamma dose rate measurements in environmental surveys.