FLASH Radiation Therapy Dosimeter
AssigneeStandard Imaging, Inc.
InventorsBrian Douglas Hooten, Shannon Mary Holmes, Myles Lawton Sommerfeldt, Raymond Terry Riddle, Larry Albert DeWerd
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Abstract
An ionization detector provides accurate measurements of high dose rate, short duration radiation pulses required by FLASH radiation therapy procedures by employing high voltages across narrow ionization channels minimizing saturation and polarization effects. Air equivalent polymers may be used to provide the electrodes of the ionization detector for improved accuracy and to resist radiation-induced degradation.
Claims20
An ionization detector system suitable for use with FLASH radiation treatments comprising:
- an ionization detector having:
- (a) a first electrode;
- and
- (b) a second electrode spaced from the first electrode by a gap of less than 0.9 mm;
- a power supply applying a voltage generating an electric field greater than 500 Vdc/mm across the gap;
- and
- a current sensor measuring charge passing between the first and second electrodes.
A method of measuring radiation output from a FLASH radiation system using an ionization detector having a first electrode and a second electrode spaced from the first electrode by a gap of less than 0.9 mm, and having a power supply applying a voltage across the first and second electrodes sufficient to create an electric field greater than 500 Vdc/mm and a current sensor measuring charge passing between the first and second electrodes, the method comprising:
- placing the ionization detector within a path of the FLASH radiation of greater than 30 Gy/s;
- and
- measuring current passing between the first and second electrode to confirm dose or dose rate.
A FLASH radiation therapy system comprising:
- a radiation source generating radiation pulses having a dose rate greater than 30 Gy/s;
- an ionization detector positioned to receive radiation pulses and having:
- (a) a first electrode;
- and
- (b) a second electrode spaced from the first electrode by a gap of less than 0.9 mm mm;
- (c) a third electrode surrounding and coplanar with the second electrode;
- a power supply applying a voltage across the first and each of the second and third electrodes electrodes sufficient to produce an electric field greater than 500 Vdc/mm;
- and
- a current sensor measuring a charge passing between the first and second electrodes.
Dependencies are inferred from the claim text.