Fluke Biomedical 37-720 - Manual (Page 5)

General Information
Introduction
1
1-1
Section 1
General Information
1.1 Introduction
System Description
The Dual-Diode Dosimeter Patient Dose Monitor combines a compact, battery operated, electrometer
with a silicon diode detector. The detector can be placed anywhere external to the patient for dose
verification and is easily held in position by taping to the skin.
The diode can be taped directly to the patient’s skin to obtain data for TLD readout values, eliminating
TLD measurements. Irregular field dosimetry is easily performed with this system. No temperature
pressure corrections need be applied to values obtained during the measurement process. The system
allows accurate and reproducible dose and dose rate data to be obtained without the necessity of
temperature equilibration or warm-up time.
Measurements can be read directly on the 3½-digit liquid crystal display (LCD) readout, eliminating
complex calculations. The electrometer has two detector inputs on the rear panel labeled DET A and
DET B. Each input has a range of 0 through 1999 cGy or cGy/min. A front panel switch enables the
selection of the detector input being utilized. Each detector has a clearly marked, screwdriver adjustable
set of calibration and zero controls mounted conveniently on the front panel. A quick response reset
button, also on the front panel, sets the system up for the next reading.
Patient Dose Monitor Model 37-720 is designed specifically for use with the silicon diode detectors
(positive output) recommended by Fluke Biomedical, Radiation Management Services (see Section 1.3).
The electrometer must be calibrated for each individual detector and radiation source.
A special feature inherent in the 37-720 is the ability to switch between DET A and DET B, using the front
panel switch, so that two detectors can be utilized for monitoring at the same time. This feature is
applicable when the measurement is being taken in the dose or rate mode. Measurements can be taken
in DOSE or RATE depending on the setting of the function switch. If it is desired to switch from one mode
to another, the RESET switch can be pressed to zero the electrometer.