Frequently Asked Questions


Q: How long is the warranty on a new unit?
A: The standard warranty is 2 years.

Q: What is included with the warranty?
A: The warranty includes calibration, all software updates, hardware defects, customer support, and calibration upkeep.

Q: If repairs are needed outside of warranty, is there an average cost to expect?
A: This is a challenge to estimate. Most customers extend their warranty, so there has not been enough out-of-warranty servicing to provide an estimate on average rates. Expect those service costs to be more expensive than the warranty cost, as our most common service repairs are user damage to the system, which can be an expensive repair (an example being users dropping the system and damaging the enclosure).

Q: During annual calibration, is there a certificate that is sent back with the equipment?
A: Yes, we provide a calibration certificate with the original shipment as well as with each successive calibration.

Q: Is there any calibration equipment that would need to be purchased in addition to the system?
A: No. The system is calibrated leaving the factory and that calibration is contained in the warranty of the system. We recommend an annual gain-drift calibration, but it is not required maintenance and can be done by the user with check sources and the web interface.

Q: Is there a discount for buying in bulk?
A: H3D offers discounts based on the number of systems purchased. Request a quotation to recieve the most up-to-date discounts.

Q: How can I get a quotation?
A: Please contact H3D, and we can provide you with a quotation for the product(s) that will best fit your needs.


Q: What is the part number for the flash drive included with the system?
A: Mushkin Enhanced Atom Series USB 3.0 Flash Drive (MKNUFDAM16GB) (available on However any flash drive (with storage size 100GB or smaller) can be used with the H series units as long as it is formatted in the Visualizer post-processing software.

Q: Why can't I delete old measurements from the flash drive?
A: H3D does not lock read/write permissions on any of our flash drives. One thing we have noticed is that some companies restrict computers while using flash drives. The user can read what is on the drive, but is unable to write to it based on the computer's security features. We recommend trying to use a non-restricted computer to write to the flash drive. If the problem persists, please contact H3D.

Q: Can the system operate on battery power?
A: Yes. Before operation, please check the User Manual for how to install the battery (A series) or the fuse (H, P, and S series). The system battery will not charge unless the fuse is installed.

Q: What is the process for source checking to verify proper response?
A: Place a check source next to the detector and verify that the system automatically identifies the correct isotope.

Q: What is the life expectancy of the system?
A: We expect the system to last for at least 10 years.

Q: Will the system ever need to be shipped back for routine work?
A: No routine work is needed; it is up to the user if they wish to send their system back for optional wellness and calibration checks.

Q: How do I download Visualizer?
A: Downloading and activating Visualizer requires an account on H3D's support website. Please contact H3D to obtain your support website account, which will come with a guide on activating Visualizer.

Miscellaneous Technical Questions

Q: What is the difference between the H100 and the H400?
A: For most situations, the H400 and H100 will provide identical results with the H400 providing the results 3 times faster due to its increased detector volume.

The more subtle difference is that the H400 is more sensitive in the forward direction compared to the side directions. If you have two sources of the same activity at the same distance from the detector, but one in front and the other on the side, the one in front will appear stronger when in reality, it is the same. This makes the H100 better for when a uniform sensitivity is important.

This could be for scenarios when determining where radioactivity is present, and the sources could be both in front of and to the side of the detector. As long as the sources are not so weak that a long count time is an issue, the H100 would be better.

Q: How does the system perform quantitative analysis?
A: The inverse square law is used to calculate the activity of the radiation source at the perspective of the detector based on the net counts collected in the peak. Algorithms are used to account for any conflicts between the detected isotopes in the case that any of the isotopes share energy lines.

If shielding is present, this can be accounted for as well by inputting the amount of shielding and our algorithms will also account for the attenuation of the shielding.

Q: How is the efficiency calibration performed?
A: Detector efficiency is measured using calibrated sources spanning the entire dynamic range at H3D's facility.

Q: Why does the system not identify all visible lines on the spectra?
A: There are a number of factors that are used in the isotope ID algorithm, such as the net area and width of the peak. If the source is not in the library, we apply especially stringent thresholds to limit the number of false alarms on unknown peaks.

If it is not detecting weak background peaks, it is becuase we have decided to trade off that sensitivity for reduced false alarms.

Q: If there are strong sources in the field of view where weak sources are also present, will only the strong sources be visualized?
A: If the strong and weak source have different energies, both can be imaged for an area.

Q: There are radiation images that appear in incorrect shapes and locations in a measurement. What causes this?
A: These images are artifacts from the imaging and localization algorithm. These artifacts are present most commonly when there are poor statistics and more data is needed for a converged image of where the radioisotopes are coming from. Typically, the image quality gauge can be used to determine when this may be the case — when the gauge shows poor quality (red quadrant), it is important to not trust the radiation image as there is insufficient data.

Have additional questions? Please contact or submit an inquiry here.

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