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 • Single, high value electrometer
• 4 1/2 digit LCD display
• Internal electronic bias: full, half and reverse polarity
• Powered by a rechargeable battery
• Extended 20,000 nC range for HDR
• Internal timer
The Advanced Therapy Dosimeter (ATD) Limited Series is a high quality, compact and affordable dosimetry electrometer that will meet the needs of most therapy applications, including brachytherapy. A unique, simple design eliminates many of the current leakage problems associated with more complicated electrometer designs.
The electrometer meets or exceeds the requirements of the AAPM ADCLs and has features found in electrometers costing far more.
Standard range setup suits most teletherapy applications, including HDR brachytherapy. Standard units are nC and nA.
The ATD Limited Series includes a built-in timer circuit for accumulation of charge vs. time. Timing periods of 50, 100 and 200 seconds have been chosen for convenient conversion of nC to nA.
The bias supply is electronic, and the unit is powered by an internal rechargeable battery. The standard input connector is triaxial BNC.
Specifications
Accuracy: ± 0.1% of reading + 1 digit
Linearity: ± 0.1% + 1 digit or precision of reading, whichever is greater
Timer: Can be preset for 50, 100, or 200 seconds
Leakage: < 5 x 10-14A
Display: 4 1/2 digit LCD
Temperature Stability: 20 ppm/°C
Warm-Up Time: 15 minutes
Input: Triaxial BNC
Output: Analog, 2V corresponds to full scale
Bias: Internal electronic bias supply 300V, -50%, -100% off, +100%, +50%, selectable on back panel. Bias voltage may be read on display. 400 V bias potential also available.
Power: Internal rechargeable 12V lead acid battery, voltage may be read on display. Low battery indicator on front panel, 120 VAC UL listed adapter provided.
Dimensions: 8.25” W x 9” D x 3.25” H
Weight: 3.75 lb
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