A backpack that searches while you walk. SPIR-Pack carries sensitive gamma detectors linked to a smartphone, so security teams can sweep large public events and crowded public places hands-free, then follow the direction of a radioactive source and identify it when the alarm goes off.
SPIR-Pack will only alarm in the presence of radioactive sources, not on background variations. That is what lets the smartphone stay in the operator's pocket until a vibration and/or audible alarm says a source is near.
The detectors ride on the operator's back, the phone stays out of sight, and nothing has to be held or pointed, so the search can blend into a crowd. Mirion positions it for protection of large public events and for readiness for radiological/nuclear interdiction.
Cover the ground at a normal pace and let the pack watch the spectrum. When it alarms, the app turns the search into a direction to follow, then names what it found.
The pack runs continuous real-time nuclide identification while the operator moves through public places and crowds, with continuous energy stabilization using ambient background (K, Ra, Th, usual contaminants).
No alarm on background variations, only on radioactive sources. Alarm indicators are vibration and sound, with earphones included, and the display updates every 0.25 s.
An innovative radar screen in the app indicates the direction of a source in a crowded location, so the operator walks toward it instead of guessing.
Seven libraries containing 80 nuclides; identifies up to eight nuclides simultaneously, including single, bare or shielded, and mixed isotopes. Reachback (email with picture, comments and spectrum), file transfer and n42 streaming get it to an expert.
The detectors connect to a rugged smartphone, readable in all lighting conditions. One multifunctional app gives dose rate, nuclide identification and a radar screen that points toward radioactive sources.

0.001 µSv/h up 100 mSv/h (0.1 µR/hr to 10 R/hr), with an energy compensated GM tube for accurate high gamma dose rate from multiple radionuclides. Doubles as a personal radiation protection alarm.
Dynamic nuclide identification from seven libraries containing 80 nuclides. Identifies sources in shielded transportation containers.
Indicates the direction of radioactive sources, turning an alarm into a heading.
Teams that also carry the SPIR-Ace use one app for both, which Mirion says greatly simplifies training time and makes both instruments easier to manage.
GPS, Bluetooth® technology, Wi-Fi, cellular communications. Share measurements by email.
The listed configuration is the G (gamma) model, pairing a 2 in. x 4 in. NaI(Tl) detector with an energy-compensated GM tube.
Gamma sensitivity to Cs-137: 3500 cps/(µSv/h) or 35 cps/(µR/h). Continuous real-time identification of single, bare or shielded, and mixed isotopes.
For accurate high gamma dose rate from multiple radionuclides.
Mirion states that SPIR-Pack provides outstanding radiation mapping capabilities. A group of SPIR-Pack units, and other instruments in the SPIR family, can be remotely monitored with SpirVIEW Mobile supervision software for complete situational awareness.

Supervisors follow the search as it happens: real-time measurements and alarms from every unit in the group.
No-loss, prioritized real-time transmission to SpirVIEW Mobile (HTTPS) or third party software (FTP, n42 files).
Real-time measurements and alarms in spe, n42 and csv formats, following the ANSI N42.42 file format.
Option: SpirVIEW Mobile real-time supervision includes SpirREPLAY: centralization, visualization and mapping. Ask us about supervision when you request a quote.
Small, lightweight, comfortable to carry, with a durable cable-free design and a long battery life for extended field operations. Figures below are for the G model.
Li-ion rechargeable, 5300 mAh, 3.7 V, built-in charger.
For the G (gamma) model listed here.
| Detectors | |
|---|---|
| Gamma detector | NaI(Tl) detector: 51 mm diameter x 102 mm length (2 in. diameter x 4 in. length) |
| Dose rate detector | Energy compensated GM tube for accurate high gamma dose rate from multiple radionuclides |
| Performance | |
| Energy range | 25 keV to 3 MeV (gamma) |
| Dose rate range | 0.001 µSv/h up 100 mSv/h (0.1 µR/hr to 10 R/hr) |
| Sensitivity | Gamma sensitivity to Cs-137: 3500 cps/(µSv/h) or 35 cps/(µR/h) |
| Identification | |
|---|---|
| Mode | Continuous real-time nuclide identification |
| Sources | Single, bare or shielded, and mixed isotopes |
| Libraries | Seven libraries containing 80 nuclides |
| Simultaneous | Identifies up to eight nuclides simultaneously |
| Stabilization | Continuous energy stabilization using ambient background (K, Ra, Th, usual contaminants) |
| Smartphone | |
|---|---|
| Display | Rugged smartphone, readable in all lighting conditions Fast display update (every 0.25 s) |
| Alarms | Alarm indicators: vibration and sound, earphones (included) Personal radiation protection alarm |
| Communications | GPS, Bluetooth® technology, Wi-Fi, cellular communications |
| Data | |
| Data available | Real-time measurements and alarms, using industry-standard file formats (spe, n42, csv) |
| Transmission | Robust (no-loss, prioritized) real-time transmission to SpirVIEW Mobile (HTTPS) or third party software (FTP, n42 files) |
| Sharing | Share measurements by email Reachback (email with picture, comments and spectrum), file transfer, n42 streaming |
| Option | SpirVIEW Mobile real-time supervision includes SpirREPLAY: centralization, visualization and mapping |
| Physical (G model) | |
|---|---|
| Weight | G: 4.6 kg (10.14 lb) |
| Dimensions | 30.3 x 25 x 46 cm (11.9 x 10 x 18.1 in.) |
| Power | |
| Battery | Li-ion rechargeable, 5300 mAh, 3.7 V, built-in charger |
| Battery life | Backpack battery life: G: 24 h |
| Charge time | 4 h |
| Environment & standards | |
| Operating temperature | -20 °C to +50 °C (-4 °F to 122 °F) |
| Operating humidity | 93% at 40 °C (104 °F) |
| Ingress | IP65 protection (even without backpack) |
| EMC | Electromagnetic compatibility according CE marking and ANSI N42.53 requirements (50 V/m immunity) |
| Standards | ANSI N42.53 ANSI N42.42 file format |
| Included accessories | |
| In the box |
|
Neutron-capable GN versions have different weight, dimensions and battery life; neutron versions (GN) are available on request.
Features and full specifications.
PDF · Mirion Same appThe portable identifier that shares the SPIR-Pack smartphone app, so one training covers both.
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View productTell us about the events, venues or areas your team needs to cover. We will come back with SPIR-Pack details and a quote, including GN neutron versions if you need them.