PAC2013 - List of Authors (Yuyama, T.)

Paper	Title	Page
THPSM01	Ion-irradiation Response of Gafchromic Films and their Application to the Measurement of the Transverse Beam Intensity Distribution	1388
	Y. Yuri, I. Ishibori, T. Ishizaka, S. Okumura, T. Yuyama JAEA/TARRI, Gunma-ken, Japan
	The response of radiochromic films, Gafchromic HD-810 and EBT2, was investigated using MeV-class proton and heavy-ion beams to apply the films to a measurement technique of the transverse beam intensity distribution at an azimuthally-varying-field cyclotron of Japan Atomic Energy Agency. The optical density of the films was increased linearly with the particle fluence of the beam in a low-fluence region. The linear-response range of the fluence was strongly dependent on ion species as well as on the film type. By analyzing the film response to absorbed dose with linear energy transfer, it was found that the sensitivity of the film was decreased for heavy-ion beams. An approximate formula was given for the practical fluence range of the Gafchromic film HD-810 on an arbitrary ion beam. The present technique with the use of the two types of Gafchromic films enables us to measure the intensity distribution of a large-area ion beam handily in a wide fluence range. Using the technique, we measured the relative intensity distribution of a large-area ion beam focused with multipole magnets and evaluated its size and uniformity.

Paper

Title

Page

Ion-irradiation Response of Gafchromic Films and their Application to the Measurement of the Transverse Beam Intensity Distribution

1388

Y. Yuri, I. Ishibori, T. Ishizaka, S. Okumura, T. Yuyama
JAEA/TARRI, Gunma-ken, Japan

The response of radiochromic films, Gafchromic HD-810 and EBT2, was investigated using MeV-class proton and heavy-ion beams to apply the films to a measurement technique of the transverse beam intensity distribution at an azimuthally-varying-field cyclotron of Japan Atomic Energy Agency. The optical density of the films was increased linearly with the particle fluence of the beam in a low-fluence region. The linear-response range of the fluence was strongly dependent on ion species as well as on the film type. By analyzing the film response to absorbed dose with linear energy transfer, it was found that the sensitivity of the film was decreased for heavy-ion beams. An approximate formula was given for the practical fluence range of the Gafchromic film HD-810 on an arbitrary ion beam. The present technique with the use of the two types of Gafchromic films enables us to measure the intensity distribution of a large-area ion beam handily in a wide fluence range. Using the technique, we measured the relative intensity distribution of a large-area ion beam focused with multipole magnets and evaluated its size and uniformity.