Miniature radiation dosimeter for in vivo radiation measurements.
We have made initial characterization measurements on a miniature radiation dosimeter which can be used for in vivo radiation measurements. It consists of a radiation sensing field effect transistor (RADFET) mounted in a 0.8 mm OD plastic catheter. The RADFET acts as a dosimeter by storing trapped charge proportional to absorbed dose. The stored charge signal can be differentiated to give dose rate. We report on the techniques for mounting, a circuit for dose readout, drift of the readings, linearity of response, temperature and angular dependence, and unpowered operation of the device.
Hughes
R C
RC
Sandia National Laboratories, Albuquerque, NM 87185.
Huffman
D
D
Snelling
J V
JV
Zipperian
T E
TE
Ricco
A J
AJ
Kelsey
C A
CA
D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage