Photoacoustical radiation dosimeter

Journal Article · Sun Jan 01 00:00:00 EST 1984 · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595456· OSTI ID:5407004

Mascarenhas, S; Vargas, H; Cesar, C L

A new type of radiation dosimeter using the photoacoustical effect is described. The photoacoustical radiation dosimeter (PARD) is capable of directly measuring the energy absorbed in the detecting element. For a completely absorbing element, the energy fluence rate in the radiation beam is measured. It is thus a calorimetric dosimeter. Since the energy sensor can be calibrated with another form of energy, it has the potential for being an absolute radiation dosemeter. Measurements were made using 50 to 100 kVp x rays with exposure rates at the detector of 2.6 x 10/sup -6/ C/kg/s (10 mR/s) to 5 x 10/sup -5/ C/kg/s (200 mR/s). The minimum measurable exposure rate at 90 kVp is 5 x 10/sup -7/ C/kg/s (2 mR/s). For a given x-ray spectrum, the PARD has a linear response with radiation intensity and an inverse response with chopping frequency. With appropriate design parameters, we believe the PARD may be used to measure any photon energy or any type of radiation particle.

• Research Organization: Instituto de Fisica e Quimica, Univ. of S. Paulo, C. P. 369, S. Carlos, S. P. Brazil, CEP 13560
• OSTI ID: 5407004
• Journal Information: Med. Phys.; (United States), Vol. 11:1
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CALORIMETRIC DOSEMETERS
PHOTOACOUSTIC EFFECT
X-RAY DETECTION
DESIGN
ENERGY ABSORPTION
SENSITIVITY
X-RAY DOSIMETRY
ABSORPTION
DETECTION
DOSEMETERS
DOSIMETRY
MEASURING INSTRUMENTS
RADIATION DETECTION
440102* - Radiation Instrumentation- Radiation Dosemeters