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Alfa Spektroskopisi (Ortec Alpha Aria)
Vacuum Chamber
| Construction | Cast brass, nickel-plated for ease of decontamination. |
| Maximum Sample Size | Aria and Duo: 51 mm (2.030 in.) Mega: 106 mm (4.18 in.) |
| Maximum Sample to Detector Spacing | 44 mm, in increments of 4 mm. |
| Maximum Detector Size | Aria and Duo: 1200 mm2. Mega: 3000 mm2. (Consult Factory) |
| Detector Connector Type | Rear Microdot (ORTEC B mount). |
| Vacuum Manifold Connector | Aria, Duo, and Mega: 0.25” Swagelok tube fitting. Ensemble: NW25. |
| Vacuum Pump Requirements | Rotary vacuum pump, 6.7 CFM (190 L/min) displacement, with oil mist trap. The ORTEC ALPHA-PPS-115 (or -230) is available for this application. |
System Performance
Based on use with a BU-017-450-100 ULTRA™ Series detector with a good-quality 241Am point source.
| Energy Resolution | ≤20 keV (FWHM) with a detector-to-source spacing equal to the detector diameter. |
| Detector Efficiency | ≥25% is achievable with close detector-to-source spacing. |
| Background | Above 3 MeV, ≤1 count/hour based on a BU-020-450-AS detector. |
Electronics
| Bias Supply | |
| Range | 0 ±100 V, 10 µA; voltage can be read by the computer. |
| Bias | Computer controlled, adjustable in 1 V increments. |
| Pos/Neg | Polarity can be selected independently with PWB slide switches (factory set for positive bias voltage). |
| Enable/Disable | By computer control. |
| Indicator | Front-panel, red LED for each channel shows if the bias is on. |
| Calibration Pulser | |
| Range | 0 to 10 MeV. |
| Pulser | Computer controls the internal pulser amplitude with 12 bit (2.5 keV) level settings; set to a nominal 7-MeV pulse when shipped. |
| Frequency | 100 Hz. |
| Frequency Stability | ≤±50 ppm/°C. |
| Amplitude Drift | ≤±150 ppm/°C. |
| Long Term Drift | ≤±0.005% of full scale/24 hours at constant temperature. |
| On/Off | Computer controlled. |
| Indicator | Front-panel, BIAS red LED flashes when pulser is on. |
| Detector Current Monitor | |
| Range | 0 to 10,000 nA; read by computer. |
| Display Resolution | 3 nA. |
| Preamplifier | |
| Charge Sensitive | Nominally 10 mV/MeV. |
| Pos/Neg | Polarity can be selected independently with PWB slide switches. |
| Digital MCA | |
| Digital Filter | 1 µs unipolar equivalent. |
| Conversion Gain | Software-selectable as 256, 512, 1024, 2048, or 4096, independent for each segment. |
| Fine Gain | Software-selectable range from 0.25 to 1. |
| Digital Offset | Software-selectable range from 0 to conversion gain setting (4096 max) in 1 channel increments. |
| Display Channels | Software-selectable range from 0 to (conversion gain – digital offset). |
| Digital Spectrum Stabilizer | Controlled via computer. |
| Dead Time Correction | Extended live-time correction according to the Gedcke-Hale method. |
| Software Controls | |
| ADC LLD | Computer controlled from 0 to 100% full scale. |
| ADC ULD | Computer controlled from 0 to 100% full scale. |
| Indicators (front panel) | |
| ADC Busy | Red LED flashes once for each digitized pulse. |
| Presets | |
| Real Time/Live Time | Multiples of 20 ms. |
| Region of Interest | Peak count/Integral count. |
| Data Overflow | Terminates acquisition when any channel exceeds 231–1. |
| Interface Connectors | |
| High Speed USB | Rear panel standard “B” type USB connector. |
Computer Prerequisites
| Any computer Windows 7 or Windows 10, 32- or 64-bit compatible. |
Alpha Aria
A single alpha spectroscopy channel in a NIM chassis. Each unit includes a variable detector bias supply (switchable positive or negative), a preamplifier, and a test pulse generator with variable amplitude.
| Vacuum Control | 3-position Pump/Vent/Hold valve, front-panel mounted. |
| Recoil Protection (RCAP) Option | No built-in pressure controller. Requires RCAP-2-120V or RCAP-2-240V. |
| Electrical and Mechanical | |
| Dimensions | 2.7 in. W x 11.9 in. D x 8.7 in. H in a double-wide NIM chassis. |
| Weight | Net 1.9 kg (4.2 lb). Shipping 2.3 kg (7.3 lb). |
| Power Input | NIM power. +6 V @ 315 mA, +12 V @ 50 mA, –12 V @ 75 mA, +24 V @ 50 mA. |
| Power Consumption | 5 W input power. |
| Operating Environment | 0° to 50°C. Up to 95% relative humidity, non-condensing. |
Alpha Duo
Benchtop dual alpha spectrometer with two alpha spectroscopy channels. Each unit includes a vacuum gauge, variable detector bias supply (switchable positive or negative), preamplifier, test pulse generator with variable amplitude, and a leakage current monitor.
| Vacuum Control | Via computer for each Alpha Duo module. |
| Vacuum Gauge Range | 200 mTorr to 20 Torr, read by computer. |
| Recoil Protection (RCAP) Option | Built-in pressure controller, requires addition of optional biased sample holders only. |
| RCAP Controller Range | 1 Torr to 13 Torr, read by computer. Regulation Target Pressure ±10%. |
| Electrical and Mechanical | |
| Dimensions | 10.1 in. W x 14.4 in. D x 6.0 in. H enclosure. |
| Weight | Net 7.5 kg (16.5 lb). Shipping 11.5 kg (25.0 lb). |
| Power Input | 120/240 V ac, 50/60 Hz. |
| Power Consumption | 10 W input power. |
| Operating Environment | 0° to 50°C. Up to 95% relative humidity, non-condensing. |
Alpha Mega
Benchtop single large alpha spectrometer. Includes a vacuum gauge, variable detector bias supply (switchable positive or negative), preamplifier, test pulse generator with variable amplitude, and a leakage current monitor.
| Vacuum Control | Via computer. |
| Vacuum Gauge Range | 200 mTorr to 20 Torr, read by computer. |
| Recoil Protection (RCAP) Option | No built-in pressure controller. Requires RCAP-2-120V or RCAP-2-240V. |
| Electrical and Mechanical | |
| Dimensions | 10.1 in. W x 14.4 in. D x 6.0 in. H enclosure. |
| Weight | Net 8.5 kg (18.7 lb). Shipping 11.5 kg (25.0 lb). |
| Power Input | 120/240 V ac, 50/60 Hz. |
| Power Consumption | 10 W input power. |
| Operating Environment | 0° to 50°C. Up to 95% relative humidity, non-condensing. |
Alpha Ensemble
Modular alpha spectroscopy system which may be configured with up to 4 modules in any combination of ALPHA-DUO-M1 and/or ALPHA-MEGA-M1 expansion modules. Each alpha spectroscopy module includes a vacuum gauge, variable detector bias supply (switchable positive or negative), preamplifier, test pulse generator with variable amplitude, self-controlled RCAP, and a leakage current monitor. Each expansion module has a separate vacuum control within an Alpha Ensemble configuration.
The Alpha Ensemble may be either rack mounted or left in the table-top mounting enclosure in which it is supplied.
Each instrument is supplied with a full set of blank panels as needed to cover unoccupied expansion space.
| Vacuum Control | Via computer for each module installed. |
| Vacuum Gauge Range | 200 mTorr to 20 Torr, read by computer. |
| Recoil Protection (RCAP) Option | Built-in pressure controller. Requires addition of optional biased sample holders. For use with ALPHA-DUO-M1 module only. |
| RCAP Controller Range | 1 Torr to 13 Torr, read by computer. Regulation Target Pressure ±10%. |
| Electrical and Mechanical | |
| Dimensions | 19.0 in. W x 19.4 in. D x 10.7 in. H enclosure |
| Weight | Net (with 4 expansion modules): 26.6 kg (58.4 lb). Shipping (with 4 expansion modules): 29.5 kg (65.0 lb) |
| Power Input | 120/240 V ac, 50/60 Hz. |
| Power Consumption | 50 W input power. |
| Operating Environment | 0° to 50°C. Up to 95% relative humidity, non-condensing. |
Alpha Aria
A single alpha spectroscopy channel in a 2-wide NIM chassis. The digital MCA is built right in, so a USB connection is all that is needed to start counting. A simple to operate PUMP/HOLD/VENT control is mounted on the front panel. The Alpha Aria is easy to add to existing NIM installations.