Scintillation Detectors Part 2

Detector Efficiency

Measure of a detector's ability to detect radiation.

Geometric Efficiency

Fraction of emitted radiation striking the detector.

Intrinsic Efficiency

Quantum detection efficiency based on photon energy.

Sensitivity

Detector's ability to count radiation in energy windows.

Thyroid Probe

Device for measuring thyroid uptake of radioiodine.

Gross Count

Measurement value from anterior neck radiation.

Background Count

Measurement value from body background radiation.

Net Count

Difference between gross count and background count.

Thyroid Uptake Measurement

Assessment of I-123 or I-131 uptake in thyroid.

Neck Phantom

Lucite cylinder for radioiodine capsule placement.

Total Body Uptake

Measurement of total body activity post-radioiodine.

Isoresponse Curve

Plot of RAIU measured at specific time intervals.

NaI Well Counter

Device for counting samples with high efficiency.

Sample Volume Effects

Impact of sample position on detection efficiency.

Dead Time Effects

Count losses due to high detection rates.

Accuracy

Closeness of measurement to the correct value.

Precision

Reproducibility of measurements under identical conditions.

QA/QC

Quality assurance and control procedures for detectors.

Energy Spectrum

Distribution of detected radiation energies.

Photopeak Energy Window

Energy range for detecting specific radiation peaks.

NIST-Traceable Source

Standard source for calibration and constancy checks.

Chi-Square Evaluation

Statistical test for measurement consistency.

Energy Resolution

Ability to distinguish between different radiation energies.

Collimator

Device that limits the angle of radiation detection.

Cylindrical NaI(Tl) Crystal

Material used in detectors for high radiation sensitivity.

Lead Shielding

Protection against unwanted radiation in detectors.

Counting Rate

Number of detected events per unit time.

Scintillation

Light emission from materials upon radiation interaction.

Quantum Detection Efficiency (QDE)

Intrinsic efficiency related to photon interactions.

Collimator Removal

Procedure for total body measurements without collimation.