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Related Concept Videos

Random and Systematic Errors01:20

Random and Systematic Errors

Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
Temperature Measurement Sites01:14

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Distance Corrections01:15

Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
Random Error01:04

Random Error

Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's forehead...

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Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise
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Published on: October 7, 2015

Influence of measurement errors on temperature-based death time determination.

Michael Hubig1, Holger Muggenthaler, Gita Mall

  • 1Institute of Legal Medicine, University Hospital Jena, Fürstengraben 23, 07740 Jena, Germany.

International Journal of Legal Medicine
|April 20, 2010
PubMed
Summary

Determining time since death using temperature models is crucial in forensics. Inaccuracies in environmental temperature and initial body core temperature measurements significantly impact the accuracy of time of death estimations.

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Area of Science:

  • Forensic Science
  • Biophysics

Background:

  • Temperature-based methods are vital for forensic death time determination.
  • Empirical double exponential models, like Henssge's, are widely used due to their flexibility.
  • These models rely on body mass, environmental temperature, and initial body core temperature.

Purpose of the Study:

  • To investigate how variations in input data affect time since death estimations.
  • To quantify the influence of environmental temperature and initial body core temperature on model accuracy.

Main Methods:

  • Utilized the law of error propagation to calculate standard deviation.
  • Employed the Monte Carlo method for error analysis.
  • Analyzed the impact of variations in environmental temperature, initial body core temperature, core temperature, and time.

Main Results:

  • Identified errors in environmental temperature measurements as a primary source of inaccuracy.
  • Deviations in initial rectal temperature were also found to be major contributors to estimation errors.
  • Quantified the standard deviation of model-based time since death estimates.

Conclusions:

  • Environmental temperature and initial body core temperature are critical factors influencing the accuracy of forensic time of death estimations.
  • Understanding these error sources is essential for refining postmortem interval calculations.
  • Further research should focus on improving the precision of these key input parameters.