Free Access
Table 1
ProtoMIRAX baseline parameters.
| Detector system | |
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| Detector type: CdZnTe (CZT) | Dimensions: 10 mm × 10 mm |
| with platinum planar contacts | × 2 mm (thickness) |
| Number of detectors: 169 (13 × 13) | Gap between detectors: 10 mm |
| Energy range: 30–200 keV | Geometrical area: 169 cm2 |
| Effective area @ 80 keV: 52 cm2 | Time resolution: 5 μs |
| (through mask, at 2.7 g cm-2) | |
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| Collimator | |
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| Blade material: Cu (0.5 mm), | Cell size: squares of 20-mm sides |
| Pb (0.5 mm), Cu (0.5 mm) | External envelope: 260 mm |
| Blade height: 81 mm | × 260 mm × 81 mm |
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| Coded mask | |
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| Material: 1 mm-thick lead | Open fraction: 0.497 |
| Basic pattern: 13 × 13 MURA | Element size: 20 mm × 20 mm |
| Extended pattern: 2 × 2 basic | Total mask dimensions: 500 mm × |
| (minus 1 line and 1 column) | 500 mm × 3 mm (total thickness) |
| Position: 650 mm from detector plane | (includes 2mm-thick acrylic substrate) |
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| Shielding | |
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| Material: lead (external – 1.5 mm), | Position: around detectors and |
| copper (internal – 0.5 mm) | collimator (sides and bottom) |
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| Imaging parameters | |
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| Angular resolution: 1°43′ | Total (fully-coded) FOV: 21° × 21° |
| Source location accuracy: 10′ (10σ) | (14.1° × 14.1°FWHM) |
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| Balloon gondola and flight | |
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| Gondola total mass: ~600 kg | Gondola dimensions: 1.4 m × 1.4 m |
| Flight altitude: 42 km (2.7 g cm-2) | × 1.8 m (height) |
| at − 23° latitude over Brazil | Single flight duration: ≲40 h |
| Pointing accuracy: ~10 arcmin | Star tracker precision: 10 arcsec |
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