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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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A WALK-IN TYPE CALIBRATION CHAMBER FACILITY FOR 222Rn MEASURING DEVICES AND INTER-COMPARISON EXERCISES.

S Trilochana1, H M Somashekarappa1, K Sudeep Kumara1

  • 1Centre for Advanced Research in Environmental Radioactivity (CARER), Mangalore University, Mangalagangothri, Mangalore 574199, India.

Radiation Protection Dosimetry
|October 31, 2019
PubMed
Summary
This summary is machine-generated.

A new radon-222 calibration chamber was established for accurate environmental radioactivity measurements. This facility enables precise calibration of devices used for detecting radon-222 gas.

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Area of Science:

  • Environmental Science
  • Nuclear Physics
  • Metrology

Background:

  • Accurate calibration of radon-222 (222Rn) detection equipment is crucial for environmental radioactivity monitoring and radiation protection.
  • Existing calibration facilities may have limitations in terms of volume, traceability, or control over environmental parameters.

Purpose of the Study:

  • To establish a walk-in type 222Rn calibration chamber with traceability to international standards.
  • To develop an innovative method for generating and controlling 222Rn concentrations.
  • To validate the spatial uniformity and performance characteristics of the chamber for calibration applications.

Main Methods:

  • Establishment of a 22.7 m3 walk-in calibration chamber with integrated human-machine interface, PLC, and sensor feedback for temperature and relative humidity control.
  • Utilization of soil gas as a source for generating 222Rn concentrations ranging from hundreds of Bq m-3 to 36 kBq m-3.
  • Determination of radon leak rates, clearance rates, and spatial uniformity using CR-39 passive devices at 23 locations.

Main Results:

  • The chamber demonstrates low radon leak rates (0.0011 h-1 with fan ON, 0.00018 h-1 with fan OFF) and a maximum clearance rate of 0.58 ± 0.07 h-1.
  • Excellent spatial uniformity of 222Rn concentration was achieved, with a mean relative standard deviation < 12%.
  • Successful demonstration of calibration using charcoal canisters and PicoRad vials, with gamma spectrometry shown as a viable alternative to liquid scintillation for PicoRad analysis.

Conclusions:

  • The newly established 222Rn calibration chamber provides a reliable and traceable facility for environmental radioactivity studies.
  • The innovative radon generation method and controlled environment ensure accurate and reproducible calibration conditions.
  • Gamma spectrometry offers a convenient alternative for analyzing PicoRad vials, enhancing the utility of the chamber for various applications.