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C
R
&
arroll
Ph. (510) 847-4213
The model 101S-DC-P from Carroll & Ramsey Associates is a radiation detector system
intended for radio-chemical synthesis and process monitoring applications in nuclear
medicine laboratories, hot cells, etc.
The system comprises a miniature detector probe, plus a trans-resistance (current-to-
voltage converter) amplifier.
The maximum gain of the transresistance amplifier is nominally 5 x10
detector current of one nano-ampere (negative polarity) can produce a voltage at the
output of the amplifier of +5 volts. A multi-turn trim potentiometer on the output of the
amplifier allows the user to adjust the overall trans-resistance gain of the system over
a range of approximately 20:1.
I
amsey
nstruments
E-mail: <sales@cr-instruments.com>
MODEL 101SDC-P SINGLE-CHANNEL
RADIATION DETECTOR
Rev. M
Copyright June, 2019
TECHNICAL DESCRIPTION
613 Skysail Lane, Fort Collins, CO 80525
<www.cr-instruments.com>
2
9
ohms, that is, a
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Table of Contents
Summary of Contents for Carroll & Ramsey Instruments 101SDC-P
- Page 1 613 Skysail Lane, Fort Collins, CO 80525 Ph. (510) 847-4213 E-mail: <sales@cr-instruments.com> <www.cr-instruments.com> MODEL 101SDC-P SINGLE-CHANNEL RADIATION DETECTOR Rev. M Copyright June, 2019 The model 101S-DC-P from Carroll & Ramsey Associates is a radiation detector system intended for radio-chemical synthesis and process monitoring applications in nuclear medicine laboratories, hot cells, etc.
- Page 2 Probe The active element in the detector probe is a silicon PIN diode which is enclosed in a thin brass capsule to shield it against light and stray electromagnetic fields. The sensitive element is parallel to the face of the probe. The probe is connected to its amplifier unit through a length of small-diameter coaxial cable.
- Page 3 ambient temperature. Offset drift is minimized by utilizing high-quality operational amplifiers with very low initial offset. Leakage current is minimized by operating the diode at zero bias into a low-impedance ("virtual ground") transresistance amplifier input. However, the diode's dark current is still of the order of a few pico-amperes at 25 C, and increases by a factor of 2 for every 5 C rise in temperature.
- Page 4 Source-Detector distance See the attached graph to determine exposure doserate as a function of distance from concentrated ("point") source of â (i.e., 511 KeV gamma in this example) activity. For very close coupling to a point source of activity, the inverse-square law has a potent effect on detector response.
- Page 5 INSTALLATION AND OPERATING ENVIRONMENT The amplifier box may be placed where radiation is present, but preferably away– or shielded from – intense sources of radiation. In North America, the operating voltage for the amplifier box is 110 VAC, 50 / 60 Hz.
- Page 6 Environment The system is intended for indoor use. Components have not been characterized for operation outside the range 0 C - 55 C. The system components and system wiring must not be in close proximity to any flame, heating element, or exposed electrical terminals.
- Page 7 TEST AND MAINTENANCE Sensitivity Sensitivity scale factor (numerical display reading) should be verified periodically against a known standard. Analog Gain Amplifier system gain may be verified by connecting a current source comprising a 1.5 VDC battery in series with a high-ohm resistor (1000 megohms or more) to the amplifier BNC input ( negative polarity) Probe The detector probe may be tested in a gross manner as an ordinary diode using a good-...
- Page 8 WARRANTY Systems are warranted against defects in materials and workmanship for a period of 1 year from date of shipment. Carroll & Ramsey's (CRI) sole obligation for products that prove to be defective will be repair or replacement. In no event shall CRI's obligation exceed the buyer's purchase price.
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