Connection of the detector to a preamplifier, and a linear amplifier
will enable a P(Y) spectrum to be accumulated on a pulse-height
analyzer when the detector is exposed to a radiation source. Proper
choice of amplifier gain settings will enable data to be obtained
for Y values from 0.5 to 1000 keV per micron. These data may be
converted to a spectrum of absorbed dose in LET with specific
The optional internal Cm244 alpha source makes calibration of
the Y axis in keV per micron particularly simple. The source allows
collimated alpha particles to cross the detector on a diameter,
producing a peak in the pulse height analyzer display. The peak
channel is characteristic of the average keV per micron expended
by the alpha particles in traversing the sphere. The alpha source
has a gravity-operated shutter mechanism that allows operation
free of unwanted alpha counts when desired.
(TE) Plastic Sphere: Wall thickness, 0.050 inch (0.127 cm); inside
diameter, 0.500 inch (1.27 cm); Shonka Type A-150 plastic, 1.12
Requirements: TE proportional counting gas; 5.63 cm Hg of TE gas
of density 1.062 g/liter corresponds to a cavity of I micron diameter;
gas must be made up of high purity components and be moisture
Bellows seal valve, Connector mates with Swagelok O-QC4-D-400
Output: Suitable for use directly into a low noise preamplifier.
Output is AC coupled.
Connector: Mates with BNC UG260 B/U or equal.
Requirements: Positive polarity, 450 volts at 2.6 cm Hg, 550 volts
at 5.25 cm Hg, 650 volts at 10.5 cm Hg.
Connector: MHV mates with UG932 A/U or equivalent.
Internal Source: CM244 ~0.3 microcuries; average alpha energy
5.8 MeV; gravity operated shutter.
Can: Vacuum tight aluminum; wall thickness, 0.007 inch (0.0178
cm); grounded to serve as electrostatic shield; maximum O.D. of
detector end 0.825 inch (2.1 cm).
Size and Weight: Length including vacuum connector 15.75 inches
(40.0 cm); weight, 230 grams; stem length: 10
Available: Thicker aluminum can, up to 0.020 inch, (0.051 cm);
no alpha source; 0.100 inch thick wall.
Includes a graph of the detectors alpha peak and a graph of Cf252
Tissue equivalent proportional counter with storage box
Optional Curium source in counter