Authorised Indian Distributor
Saxsons Group
New Delhi, India · Since 1997
MAX 4000 PlusReference Electrometer
Versatile and accurate. One of the most widely used reference electrometers in radiotherapy — covering absolute dosimetry, patient dosimetry, SRS and all QA protocols from daily output to annual calibration.
Key Features
- Reference-grade for all radiation therapy dosimetry applications
- Exceptional current range: 0.001 pA to 500.00 nA
- Charge range: 0.01 pC to 999,999 nC
- 0.1% repeatability — exceeds TRS-398 and TG-51 requirements
- Leakage current less than 1 fA — lowest in class
All Features
- Reference-grade for all radiation therapy dosimetry applications
- Exceptional current range: 0.001 pA to 500.00 nA
- Charge range: 0.01 pC to 999,999 nC
- 0.1% repeatability — exceeds TRS-398 and TG-51 requirements
- Leakage current less than 1 fA — lowest in class
- Digital filter technology eliminates RF and environmental noise
- Redesigned display for improved readability and clarity
- MAX COMM™ software for dose/dose-rate control and data logging
- Remote electrometer operation via MAX COMM interface
- Chamber and detector management built-in
- Stereotactic and small-field dosimetry compatible
- Suitable for absolute, relative and patient dosimetry
Technical Specifications
| Current range | 0.001 pA to 500.00 nA |
| Charge range | 0.01 pC to 999,999 nC |
| Repeatability | 0.1% |
| Leakage current | < 1 fA |
| Noise reduction | Digital filter technology |
| Display | Redesigned high-visibility display |
| Software | MAX COMM™ — dose, dose-rate, logging, remote |
| Remote operation | Yes — via MAX COMM |
| Chamber management | Built-in detector database |
| Applications | Absolute, relative, patient dosimetry; SRS; daily/monthly/annual QA |
| Standards | TRS-398, TG-51, TG-142 compatible |
Applications
One electrometer — the full dosimetry spectrum
Absolute Reference Dosimetry
TRS-398 and TG-51 reference dosimetry with Farmer-type chambers. 0.001 pA minimum current resolves even the smallest ionisation signals.
Annual & Monthly Machine QA
Accurate output measurements for TG-142 annual and monthly QA. Remote operation via MAX COMM frees the physicist from the vault during irradiation.
Patient Dosimetry
In-vivo and point-dose patient dosimetry with compatible diode and IC detectors. Data logging to MAX COMM for audit trail.
SRS / Stereotactic Applications
Measures very small ionisation currents (< 1 pA) required for small-field SRS chamber characterisation without saturation or noise.
Daily Output Monitoring
Fast digitisation with digital filter for clean, repeatable daily output measurements. Chamber correction factors stored in device memory.
Electron Beam Dosimetry
Full charge integration mode for pulsed electron beam measurements. Compatible with parallel-plate chambers for electron reference dosimetry.
Why MAX 4000 Plus?
From the smallest small-field SRS measurement to the largest calibration beam, the MAX 4000 Plus covers nine decades of current without switching external hardware.
Sub-femtoampere leakage is the lowest specification available in a clinical electrometer. Measurements near detection threshold are not polluted by instrument leakage.
Three decades of precision electrometer design. The MAX 4000 Plus is in routine clinical use at thousands of radiotherapy centres worldwide.
The reference electrometer for Indian radiotherapy
Contact Saxsons Group for pricing, AERB import documentation, calibration traceability and installation support.