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Search Publications by: Huaiyu Heather Chen-Mayer (Fed)

Displaying 51 - 75 of 128

Measuring the Gy  preventing convection in water calorimetry using a low duty cycle modulated beam

October 1, 2011

Author(s)

Huaiyu H. Chen-Mayer, Ronald E. Tosh

The most fundamental method for determining the absorbed dose to water by radiation beams is by measuring the consequent temperature increase of the water. Water calorimeters used for this purpose are not irradiated uniformly; thus, spatial dose gradients

Time-resolved radiation beam profiles in water obtained by ultrasonic tomography

December 31, 2010

Author(s)

Eugene Malyarenko, Joseph Heyman, Heather H. Chen-Mayer, Ronald Tosh

This paper presents a practical ultrasonic system for near real-time imaging of spatial temperature distributions in water caused by absorption of radiation. Initial testing with radiation from a highly attenuated infrared lamp demonstrates that the system

Heat Transfer Effects in a Water Calorimeter for Measuring the Absorbed Dose of Therapy-Level Radiation Beams

October 1, 2007

Author(s)

Ronald E. Tosh, Huaiyu H. Chen-Mayer

Water calorimetry that directly measures the temperature rise (at the mK level) due to radiation heating is used as a primary standard for therapy-level gamma-radiation beams. The temperature rise is measured at a given point in space where the spatial

A Transfer-Function Approach to Characterizing Heat Transport in Water Calorimeters Used in Radiation Dosimetry

June 1, 2007

Author(s)

Ronald E. Tosh, Huaiyu H. Chen-Mayer

The calibration chain for medical radiotherapy beams requires a primary reference standard that defines the quantity of absorbed dose to water. Water calorimetry is the most direct technique for such measurements; however, its susceptibility to systematic

What Spectral Methods Can Tell Us About Heat Transfer Effects in Water Calorimeters

May 1, 2007

Author(s)

Ronald E. Tosh, Huaiyu H. Chen-Mayer

In water calorimetry, numerous ancillary effects such as radiation-induced chemical reactions, scattering and excess heat from nonwater materials, and dose nonuniformities within the phantom complicate the determination of absorbed dose from measurements

A High Resolution Ultrasonic Thermometer for Measuring Absorbed Dose in Water Calorimeters

January 1, 2007

Author(s)

Huaiyu H. Chen-Mayer, Ronald E. Tosh

Frequency-domain Characterization of Heat Conduction in Sealed Water Calorimeters

January 1, 2007

Author(s)

Ronald E. Tosh, Huaiyu H. Chen-Mayer

Absorbed Dose to Water Calibration of Ionization Chambers in a 60 Co Gamma-Ray Beam

September 1, 2006

Author(s)

Ronaldo Minniti, J Shobe, Stephen M. Seltzer, Huaiyu H. Chen-Mayer, S R. Domen

Absorbed-dose-to-water calibrations are important to the medical community to facilitate the accurate determination of doses delivered to tumors during external-beam cancer therapy. The first version of this document offered an absorbed-dose-to-water