spectral_xray op• Data kinds: none → pairs (an op determined by its arguments alone — it takes no image or data input)
• Call: import fullseye as fs; fs.ledger.material_xray_attenuation(material='CU', e_min_kev: 'float' = 10.0, e_max_kev: 'float' = 150.0, n_points: 'int' = 141, quantity: 'str' = 'mu_rho', density_g_cm3=None) -> 'np.ndarray' (to call the implementation directly, import materials; materials.material_xray_attenuation(material='CU', e_min_kev: 'float' = 10.0, e_max_kev: 'float' = 150.0, n_points: 'int' = 141, quantity: 'str' = 'mu_rho', density_g_cm3=None) -> 'np.ndarray'; from the registry, opstomography.get("material_xray_attenuation"))
Return a material's X-ray attenuation as pairs (E [keV], value); the mass attenuation coefficient μ/ρ [cm²/g] by default.
> The detailed description below is the original text — the summary and the headings are translated.
material: 名前(WATER / MUSCLE / BONE / PVC / CU / SAPPHIRE …、material_xray_table の一覧)、化学式("Al2O3")、または {"composition": "C2H4" か {"SiO2": 0.7, …} か ((Z, w), …), "density_g_cm3": 0.93}。quantity: mu_rho(全減衰、干渉性散乱を含む)/ mu_en_rho(エネルギー吸収)/ mu(線減衰係数 μ = ρ·μ/ρ [1/cm]、密度が要る)。
格子は e_min_kev〜e_max_kev の対数等間隔 n_points 点。吸収端(Cu の K 端 8.979 keV など) の上下は表の 2 行のあいだで飛ぶ —— 格子に端ちょうどの点があれば端の上の値になる。表は 1 keV〜1 MeV(NIST の行の log–log 補間、NIST が推奨する補間)。範囲の外は ValueError。
公表値(NIST SRD 126): Cu の 8 keV で 52.55 cm²/g、K 端 8.979 keV で 38.29 → 278.4 cm²/g、水の 60 keV で 0.2059 cm²/g。
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_dual_energy_xray — py -3.11 examples/poc_dual_energy_xray.py
• poc_geodetic_height_frames — py -3.11 examples/poc_geodetic_height_frames.py
pairs as input)xray_beam_quality · photon_counting_channels · dual_kvp_channels
spectral_xray)material_xray_table · material_xray_constants · material_effective_z · xray_tube_spectrum · xray_beam_quality · photon_counting_channels · dual_kvp_channels · xray_channel_projection
*Provenance: materials.py — TOMOGRAPHY operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.