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Updated: Mar 28, 2026

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers

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Using a dose-area product for absolute measurements in small fields: a feasibility study.

S Dufreneix¹, A Ostrowsky, M Le Roy

¹CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), F-91191 Gif-sur-Yvette, France.

Physics in Medicine and Biology

|December 23, 2015

Summary

This summary is machine-generated.

Researchers developed a new method using the dose-area product for small radiation fields. This approach, using a graphite calorimeter and ion chamber, offers accurate dosimetry for fields smaller than 2 cm x 2 cm.

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Medical Physics
Radiation Dosimetry

Background:

Current dosimetry systems face challenges with field sizes smaller than 2 cm x 2 cm.
Accurate absorbed dose measurements at a point are difficult in small radiation fields.

Purpose of the Study:

To extend the dosimetric reference system for small radiation fields (less than 2 cm x 2 cm).
To investigate the use of the dose-area product as a new dosimetric quantity.

Main Methods:

Designed and utilized a graphite calorimeter and a plane parallel ion chamber (3 cm diameter).
Performed measurements in small radiation fields (0.75 cm, 1 cm, and 2 cm diameter).
Established calibration factors in terms of dose-area product in water.

Main Results:

The detector surface (3 cm) was larger than the beam sections, mitigating issues with absolute dose measurements.
Achieved calibration factors for the ion chamber in terms of dose-area product.
Obtained an uncertainty smaller than 0.9% for the established calibration factors.

Conclusions:

The dose-area product is a viable quantity for dosimetry in small radiation fields.
The developed method provides accurate and reliable calibration factors for small fields.
This approach extends the applicability of reference dosimetry systems to smaller field sizes.