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Radiation Oncology - Dosimetry

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Advanced Therapy Dosimeter
Model 35040

Advanced Therapy Dosimeter Model in India Power requirem ents Dimen sions Ion chamber calibration factors Bias

• Wide measurement range, up to 1.000 μA and 19.999 mC for HDR Brachy therapy applications
• Automatic reset and hold of measured values between exposures
• Front panel adjustment of exposure threshold and user disable of threshold to permit manual operation
• Thirty‐two ion chamber calibration factors
• Automatic power‐down after user specified time period, when operating from battery supply
•Annunciators warn of low battery, low bias, and operational errors

•Large capacity battery provides eight hours of continuous operation; fast recharge in less than three hours,  even during operation

 Model 35040 Advanced Therapy Dosimeter (ATD) is a reference grade instrument used to measure the charge and  
current from ion chambers in Radiation Therapy, and provides bias voltage for all commonly used chambers. Front panel controls select ion chamber calibration factors. Facilitate entry of temperature and pressure values for air density correction allow bias voltage selection, threshold level, timer control and choice of display screens. The user can customize the display screen can simultaneously show dose, exposure time, dose rate, effective exposure time, average current/rate, accumulated charge/dose, bias voltage, leakage, and other important information that ensures the validity of instrument. The customization software allows design of 16 screens that display conditions, parameters, values and text. Up to 32  chamber factors, 11 bias voltage can be programmed. It is PC compatible and connects vai a RS‐232 cable. The user can customize the display for basic use or for specialized applications such as brachy therapy. The advanced therapy dosimeter exceeds the recommendations of calibration laboratories for leakage, linearity, and stability by a wide range. This  instrument raises the standard of radiation therapy instruments.
Charge full scaleCharge sensitivityCurrent full scaleCurrent
200.00 pC0.1 pC200.0 pA0.1
2.0000 nC0.0001 nC2.000 nApA
20.000 nC0.001 nC20.00 nA0.001
200.00 nC0.01 nC200.0 nAnA
2.0000 μC0.0001 μC1.000 μA0.01
20.000 μC0.001 μCnA
200.00 μC0.01 μC0.1
2.0000 mC0.0001 mCnA
20.000 mC0.001 mCThe scanner assembles/dissembles in
approx. 5 minutes

Effective exposure time ranges

Charge full scaleCharge sensitivity
Full scale rangeDisplay Resolution
59.99s0.01 s
5 hr 33 min 19.99 s0.1 s
StabilityDesigned for ultra long‐term stability error of approximately
LeakageVirtually removes effects of total system leakage during measurement. Uncorrected
leakage < 10 fA over temperature range
LinearityMaximum non‐linearity variation from straight line of 0.1% of all charge and current
Resolution0.005% of range (4.5 digits) for charge, dose, average rate and average current; 0.05%
of range (3.5 digits) for current and rate
Warm‐upFully meets specifications within five minutes of applying power
Measurement accuracy64º to 82ºF (18° to 28°C); charge ± (0.20% reading plus two counts); current ± (0.20%
reading plus two counts)
BiasEleven user‐programmable steps from ‐ 500 to + 500 V in 0.1 volt increments; accuracy
± 0.3 V for loads < 0.2 mA; front panel selectable
Ion chamber calibration factorsThirty‐two user‐programmable calibration factors; front panel selectable
Display unitsAll practical radiation and electrical units
RS‐232 computer configurationFor customizing and data transfer
Power requirem entsInternal lead acid battery; Integral charger operates 100 to 240 VAC (47 to 63 Hz
Power requirem entsTriax BNC front/rear 35040; Triax TNC front/rear 35040TN C
Dimen sions9.4 (w) x 10 (d) x 4 in (h) (21.6 x 26 x 8.9 c m
Weight10 lb (4.6 kg)

Meditronix Corporation 
G-236, Sector-63,
Noida - 201 303. INDIA

Phone: +91-120-2406096, 4263270
Fax: +91-120-2406097