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New approach to simultaneous micro and macro dosimetry in neutron therapy with a MOSFET probe

Conference Paper


Abstract


  • The knowledge of linear energy transfer (LET) spectra of charged particles is important for better estimation of the biological efficiency of neutron radiation therapy. A novel approach to simultaneous micromacro dosimetry with a semiconductor MOSFET probe has been developed. The response of a MOSFET probe to alpha particles and gamma radiation showed the possibility of separately measuring the low and high LET components in a mixed gamma-neutron radiation field. The proposed new approach to micro- macro dosimetry was studied in the fast neutron beam at Harper Hospital, Detroit, Michigan. By using a single MOSFET sensor, the pattern of energy deposition of the secondary charged particles in a micron-size silicon volume was measured simultaneously with the average absorbed dose. A depth-dose distribution profile in a water phantom was measured. Good agreement was observed between the neutron depth-dose distribution obtained by a MOSFET in the integral mode and a tissue-equivalent ionization chamber.

Publication Date


  • 1997

Citation


  • Rosenfeld, A. B., Kaplan, G. I., Carolan, M., Allen, B. J., Kota, C., Maughan, R. L., & Yudelev, M. (1997). New approach to simultaneous micro and macro dosimetry in neutron therapy with a MOSFET probe. In Journal of Brachytherapy International Vol. 13 (pp. 129-136).

Scopus Eid


  • 2-s2.0-0030778158

Web Of Science Accession Number


Start Page


  • 129

End Page


  • 136

Volume


  • 13

Issue


  • 1

Abstract


  • The knowledge of linear energy transfer (LET) spectra of charged particles is important for better estimation of the biological efficiency of neutron radiation therapy. A novel approach to simultaneous micromacro dosimetry with a semiconductor MOSFET probe has been developed. The response of a MOSFET probe to alpha particles and gamma radiation showed the possibility of separately measuring the low and high LET components in a mixed gamma-neutron radiation field. The proposed new approach to micro- macro dosimetry was studied in the fast neutron beam at Harper Hospital, Detroit, Michigan. By using a single MOSFET sensor, the pattern of energy deposition of the secondary charged particles in a micron-size silicon volume was measured simultaneously with the average absorbed dose. A depth-dose distribution profile in a water phantom was measured. Good agreement was observed between the neutron depth-dose distribution obtained by a MOSFET in the integral mode and a tissue-equivalent ionization chamber.

Publication Date


  • 1997

Citation


  • Rosenfeld, A. B., Kaplan, G. I., Carolan, M., Allen, B. J., Kota, C., Maughan, R. L., & Yudelev, M. (1997). New approach to simultaneous micro and macro dosimetry in neutron therapy with a MOSFET probe. In Journal of Brachytherapy International Vol. 13 (pp. 129-136).

Scopus Eid


  • 2-s2.0-0030778158

Web Of Science Accession Number


Start Page


  • 129

End Page


  • 136

Volume


  • 13

Issue


  • 1