D + D Fusion Rate Calculator
BTI Neutron Detectors

This page is provided for researchers working in the field of deuterium fusion, who wish to calculate fusion rates and energy quotients based on measurements taken with a neutron detector.

The BTI Bubble detector has become the industry standard among both amateur and professional scientists working in this field, because of its sensitivity to neutrons without being affected by other forms of radiation, but this calculator can be used with any neutron detector

The calculator Provides a quick an easy way to convert your neutron detector counts to actual fusion reaction rates.

For the conversion from mRem to neutron counts, we have used a fixed dose of 28,000 n/cm^2/mRem for monoenergetic neutrons of 2.45 Mev., this estimate is based on figures released by the United States Nuclear Regulatory Commission paragraph 20.1004

If you happen to have a BTI bubble detector, calibrated to 28 bubbles per mRem, calculating the number of neutrons per cm^2/b is simple:

28,080 neutrons/28 bubbles =~ 1000 neutrons/cm^2/bubble

Note: Due to the low efficiency of bubble detectors, best results are obtained when running the experiment long enough to generate more than 30 bubbles. Run your experiment and collect your data to the highest accuracy possible with your equipment, and input the data below, to calculate the energy quotient (Q).

Cathode potential kV
Current input mA
Bubbles or counts #
Detector Calibration #/mRem
Detector distance/radius cm
Exposure time s
Supp power - Ion guns etc. Watt


Detector Exposure: mRem
Neutron flux at detector: n/s/cm2
Neutrons isotropic n/s
Total D+D fusion reactions fusions/s

Proton energy (3.02 Mev) ev/s
Triton energy (1.01 Mev) ev/s
Neutron energy (2.45 Mev) ev/s
He3 nucleus energy (0.82 Mev) ev/s
Total fusion energy ev/s
Input Power - Electrical: Watt
Output Power - Fusion Watt

Power Out / Power In (Q) -

Click here for list of other fusion reactors by energy quotient

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