YANI
Yet Another Nuclide Inventory. A material, an irradiation schedule and a neutron spectrum in; inventories, activities, decay heat and decay photon spectra out.
pip install yani
import yani
yani.cross_section_data = "tendl-2025"
yani.transmutation_reactions = "tendl-2025"
yani.transmutation_branch_ratios = "tendl-2025"
yani.transmutation_decay_data = "endf-b8.1" # TENDL has no decay data
yani.transmutation_fission_yields = "endf-b8.1" # nor fission yields
steel = yani.materials.pnnl.material("Steel, Stainless 316", volume=1000.0)
spectrum = yani.NeutronSource(
energy=yani.sources.Histogram([1e-5, 1e5, 1e6, 1.5e7], [1e12, 1e13, 1e14])
)
schedule = yani.PulseSchedule([
yani.Pulse(rate=1.11e14, duration=(1, "a"), source=spectrum),
yani.Cooldown(duration=(1, "d")),
])
final = steel.transmute(schedule=schedule)[-1]
print(final.activity(), "Bq")
print(final.decay_heat(), "W")
print(final.contact_dose(), "Gy/h")
What it solves
The nuclide inventory under irradiation is the Bateman equations with reaction
terms, dN/dt = A N, solved as a matrix exponential N(t) = exp(A t) N(0) by
CRAM at order 48. The solver is Rust; the wheel needs no compiler and no
external toolchain.
What this repository contains
Documentation, packaging and release automation. The code lives in the
yani-core wheel this package depends on, which provides the yani module
itself, its type stubs and its docstrings. pip install yani pulls it in.
That arrangement is why there is no Python here: one source of truth for the API, and no re-export layer that can drift from it.
1 maintainer
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