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Directional Dependence of Gafchromic LD-V1.

Shinnosuke Nishihara¹, Tatsuhiro Gotanda², Tomoyuki Hasuo^1,3

¹Health Science and Technology, Graduate School of Health Science and Technology, Kawasaki University of Medical Welfare, Okayama, Japan.

Journal of Medical Physics

|April 6, 2026

Summary

Gafchromic LD-V1 film shows varying sensitivity based on X-ray incidence angle. While perpendicular incidence yielded 54.5% relative sensitivity, other angles exceeded 90%, indicating its usability for non-perpendicular measurements.

Keywords:

Directional sensitivity gafchromic LD-V1 radiochromic film

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Area of Science:

Medical Physics
Radiation Dosimetry

Background:

Gafchromic LD-V1 is a flexible, sensitive radiochromic film for radiation measurement.
Angle of incidence can affect film sensitivity, impacting measurement accuracy.

Purpose of the Study:

To investigate the directional dependence of Gafchromic LD-V1 sensitivity on an acrylic phantom surface.
To determine if LD-V1 can accurately measure radiation at non-perpendicular incidence angles.

Main Methods:

Irradiation of Gafchromic LD-V1 film on an acrylic phantom using X-rays.
Measurement of relative film sensitivity at perpendicular and various oblique angles of incidence.

Main Results:

Relative sensitivity at perpendicular X-ray incidence was 54.5%.
Relative sensitivity at angles other than perpendicular incidence exceeded 90%.
LD-V1 demonstrates significant sensitivity variation with the angle of X-ray incidence.

Conclusions:

Gafchromic LD-V1 exhibits directional dependence in sensitivity.
The film is suitable for radiation measurements even when X-rays are incident at angles other than perpendicular.