Harpell Associates - Radiation Oncology, Medical Physics, Diagnostic Imaging, Nuclear Medicine, PET, Radiology, Ultrasound, Radiation Safety

Model 11TW chambers are thin-window versions of Model 11 chambers. These units employ a stretched conductive Kapton film of thickness 0.001 inches (3.85 mg/cm2).

Since the external dimensions of Model 11 and 11TW chambers are the same and both models use the same collector-guard arrangement, the air gap is 3 mm giving a sensitive gas volume of nearly 1 cm3 for standard-sized collector.

A protective cover is available to set over the window for underwater operation. Model A15, not suited for underwater use, is similar to A11TW but with an increased air gap for use in mammography.

Features:

Planar geometry

Homogeneous construction

Complete guarding

Thin stretched conductive window

Waterproof with cover over window

Low mass collector

Gas flow capability

Integral flexible low-noise cable

Separable minimum scatter stem

Handsome wooden case

Collecting Volume:	0.94 cm3
Nominal Calibration Factor:	3.4 R/nC
Centroid of Collecting Volume:	1.5 mm from surface of window
Collector Diameter:	20.0 mm
Window-Collector Gap:	3.0 mm
Window:	Conductive Kapton film, 3.86 mg/cm2
Body, Collector, and Guard Material:	Model A11TW – Shonka air-equivalent plastic C552 Model P11TW – Polystyrene equivalent plastic D400 Model T11TW – Shonka tissue-equivalent plastic A150
Maximum Polarizing Potential:	Greater than 1000 V
Inherent Leakage Currents:	Less than 10-15 Amperes
Cable:	50 Ohms, 29pF/f, 3 m long
Signal Connector:	Choice of coaxial BNC and triaxial BNC and TNC plugs and jacks.
High Voltage Connector:	Integral with triaxial connectors (shell of chamber is common with connector body). Banana, MHV, and SHV plugs are also available.
Vent Tubes:	Two 21 Ga stainless steel tubes which may be extended to connector via 22 Ga TFE tubing for possible immersion in liquid phantoms. (Chamber immersion requires a cover over the window.)
Stem:	7/16" OD black phenolic two-piece (4" + 5")

Part #	Description	Collecting Volume
MT-ERI-A11TW	Air equivalent chamber	0.94 cm3
MT-ERI-P11TW	Polystyrene equivalent chamber	0.94 cm3
MT-ERI-T11TW	Tissue equivalent chamber	0.94 cm3



Manufacturers	Radiation Oncology	Medical Physics	Diagnostic Imaging	Radiation Safety	Exercise Systems

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