Alpha Particle Irradiation Simulation
— Moist Atmosphere Reaction Process

Quantum Physics Visualization  /  Established Science  /  Interfaced with Katakamuna

Scientific Evidence Base All parameters in this diagram are based on established scientific knowledge: NIST/CODATA standard values, the Standard Model of quantum chromodynamics (QCD), the Bethe-Bloch equation, and experimentally verified radiation chemistry data.

I. Standard Moist Atmosphere (RH 50%, 25°C, 1 atm)

N₂
76.87 vol%
O₂
20.62 vol%
H₂O
1.56 vol%
Ar
0.92 vol%
Molecular Density
2.46×10²⁵ /m³
Mean Free Path
λ ≈ 68 nm
Moist atmosphere molecular snapshot — N₂, O₂, H₂O, Ar at RH 50% Molecular snapshot of moist atmosphere at RH 50%, 25°C, 1 atm. All H₂O shown as isolated gas-phase molecules (no clustering). Molecular snapshot — schematic scale / thermal velocity vectors shown N≡N triple bond 515 m/s N≡N N≡N N≡N ↑ ↑ O=O paramagnetic ↑↑ O=O Ar closed shell / inert μ=1.85 D O lp lp H H 104.5° δ− δ+ δ+ H₂O (monomer) sp³ hybrid / 591 m/s O H H H₂O (monomer) λ ≈ 68 nm (mean free path, schematic) N₂ — triple bond, diamagnetic O₂ — double bond, paramagnetic ↑↑ H₂O — polar, δ−O/δ+H, lp = lone pair Ar — closed shell

Fig. 1 — Molecular snapshot of moist atmosphere (RH 50%, 25°C, 1 atm). All H₂O molecules shown as isolated gas-phase monomers — no cluster or hydrogen-bond network included.

II. Alpha Particle Irradiation — 3-Stage Reaction Process

Formal Name
⁴He²⁺ (He nucleus)
Composition
2 protons + 2 neutrons
Charge
+2e
Mass
3,727 MeV/c²
Binding Energy
28.3 MeV
Spin
0 (boson)
Alpha particle (⁴He nucleus) — internal quark-gluon structure Two protons (uud×2) and two neutrons (udd×2) with gluon exchanges and nuclear force shown. ⁴He nucleus — confinement radius ≈ 1.7 fm Proton p (uud) u u d Proton p (uud) u u d Neutron n (udd) u d d Neutron n (udd) u d d nuclear force Alpha Particle Properties Total quarks u×6 + d×6 = 12 Electric charge +2e (bare nucleus) Spin 0 (boson) Binding energy 28.3 MeV (extremely stable) Specific ionization >100× beta radiation Range in air few cm (energy-dependent) * Quark composition unchanged before/after irradiation (strong force conservation) ── gluon (virtual exchange) ── nuclear force (π meson)

Fig. 2 — Internal quark-gluon structure of the alpha particle (⁴He nucleus): 2 protons (uud) + 2 neutrons (udd). Color-confined state. u = up quark (gold), d = down quark (blue), gluons = green dashed lines.

Primary Interaction
Coulomb scattering
H₂O Ionization Energy
12.6 eV/molecule
O-H Bond Dissociation
4.76 eV
N₂ Ionization Energy
15.6 eV
O₂ Ionization Energy
12.1 eV
Stopping Power Law
Bethe-Bloch eq.
Alpha particle collision and ionization process in moist atmosphere α particle (+2e) collides with N₂, H₂O, O₂ via Coulomb interaction, causing ionization and bond dissociation. Bragg peak shown at bottom. α +2e Alpha particle trajectory — Coulomb field (+2e) N₂ N N e⁻ N₂⁺ + e⁻ ionization: 15.6 eV O H H H₂O O H ↑ ·OH radical E° = +2.80 V p H⁺ (uud) O-H bond cleavage: >4.76 eV O₂ O· O· e⁻ O· + O· + e⁻ reactive oxygen radicals Bragg Peak — Ionization density maximum at end of particle range Penetration depth → 0 max Bragg peak max. ionization Incident → End of range

Fig. 3 — Coulomb scattering ionization and dissociation by α-particle (+2e). The most critical reaction: H₂O → ·OH + H⁺ (O-H bond cleavage at >4.76 eV). Bragg peak shown at bottom.

Product ①
·OH radical
Product ②
H⁺ proton
Product ③
e⁻ secondary electron
Product ④
O₂⁻· superoxide
Products and subsequent reactions after alpha particle irradiation Electronic configurations of ·OH radical, H⁺ proton, and secondary electron, plus subsequent radical chain reactions. ·OH Hydroxyl Radical O δ− H ↑ unpaired e⁻ Lifetime: μs order Redox: E° = +2.80 V 2nd strongest oxidizer (after F₂) H⁺ Proton p +1e u u d No electrons (bare proton) Quarks: uud Immediately absorbed by H₂O → H₃O⁺ charge: +1e Secondary Electron e⁻ e⁻ −1e Spin: 1/2 Triggers further ionization δ-ray range: nm – μm H₂O capture → e⁻(aq) Subsequent Radical Chain Reactions ① H₂O → ·OH + H· O-H cleavage (4.76 eV) Primary radical source ② H⁺ + H₂O → H₃O⁺ Proton hydration (instant) Local acidification ③ ·OH + ·OH → H₂O₂ ④ e⁻ + O₂ → O₂⁻·

Fig. 4 — Primary products after alpha particle irradiation: ·OH radical, H⁺ proton, and secondary electron e⁻, with subsequent radical chain reactions.

Product Formula Properties Subsequent Reaction Evidence Method
Hydroxyl radical ·OH E° = +2.80 V / lifetime μs ·OH + ·OH → H₂O₂ Pulse radiolysis
Proton H⁺ (uud) +1e / bare proton H⁺ + H₂O → H₃O⁺ Mass spectrometry / ESR
Secondary electron e⁻ (δ-ray) −1e / spin 1/2 e⁻ + O₂ → O₂⁻· Wilson cloud chamber
Superoxide radical O₂⁻· 1 unpaired electron O₂⁻· + H⁺ → HO₂· ESR spectroscopy
N₂⁺ ion N₂⁺ +1e / paramagnetic N₂⁺ + e⁻ → N₂* Emission spectroscopy
Hydrated electron e⁻(aq) −1e / solvated e⁻(aq) + O₂ → O₂⁻· Pulse radiolysis

III. Scientific Evidence Reference

Bethe-Bloch Equation / Bragg Peak Quantitative formulation of charged particle stopping power. Describes the ionization density maximum at the end of the alpha particle range. Experimentally verified in proton and heavy-ion radiotherapy applications.
Quantum Chromodynamics (QCD) / Standard Model Theoretical framework for quarks (u/d), gluons, and color confinement. The internal quark composition of the alpha particle (uud×2 + udd×2) is invariant under electromagnetic reactions.
Radiation Chemistry / Pulse Radiolysis Production of ·OH (E° = +2.80 V), H⁺, e⁻(aq), and O₂⁻· has been experimentally identified and quantified. Verified by ESR, emission spectroscopy, and mass spectrometry.
H₂O Molecular Orbital Theory (MO) / VSEPR HOMO (1b₁ orbital) = lone pair acting as nucleophilic site. O-H bond energy: 459 kJ/mol = 4.76 eV. sp³ hybridization and bond angle 104.5° precisely measured by X-ray diffraction and spectroscopy.
H₂O Composition Correction (RH 50%, 25°C) H₂O partial pressure = saturated vapor pressure (3,169 Pa) × 0.50 = 1,584 Pa → volume fraction ≈ 1.56%. Dry air components corrected accordingly: N₂ → 76.87%, O₂ → 20.62%, Ar → 0.92%. All H₂O shown as isolated gas-phase monomers. Clustering excluded: thermal energy k_BT ≈ 25.7 meV exceeds hydrogen bond stabilization energy at 25°C gas phase.
Alpha Particle — 3-Layer Reaction Model | Jinco’s Katakamuna

Elemental States Induced by Alpha Particles
— 3-Layer Reaction Model

GIP-PHY-03-2026  |  Interface · Gas-Phase · Macro-Diffusion Integrated Diagram based on Latest Research Data

Literature Basis This diagram is grounded in: plutonium-oxide surface radiolysis studies, Geant4 physical simulations, radiation-chemistry three-phase G-value data, atmospheric chemical transport models (CTM), Hanford Site VOC decomposition demonstrations, and low-dose hormesis effect research.

Overall Structure — 3-Layer Cascade Model

3-Layer Reaction Cascade: Interface / Gas-Phase / Macro-Diffusion 4MeV α ⁴He²⁺ LAYER 1 Interface Layer Adsorbed Water Layer (nm-scale) — H₂O molecules adsorbed on surface Material Surface Impact Interface ·OH ·OH ·OH H⁺ H⁺ H⁺ e⁻ e⁻ Active Ionization Platform Instant ·OH/H⁺ emission — no external power Radiolysis at Interface LAYER 2 Gas-Phase Layer Ionization Track Dense Cylinder H₂O H₂O H₂O ·OH gas-phase ·OH ·OH H⁺ High G-Value (Gas Phase) No cage effect Escaped recombination High initial survival rate 1.56 vol% H₂O vapor in atmosphere → held as isolated active species in 30mm space LAYER 3 Macro-Diffusion Layer Forced convection (circulator) ·OH ·OH ·OH VOC Odor Degrade Initialize Domino Effect — Chain Electron Stripping Plume-in-Grid / CTM Deep Convection Model Rapid transport of local high-density radical plumes 30 mm (α-particle range) Theoretical Pillars Geant4 Physics Simulation Hanford Site VOC Decomposition Data © Jinco’s Katakamuna / GIP-PHY-03-2026 / α-particle induced 3-layer reaction model

Fig. 1 — Overall architecture of the 3-layer cascade induced by α-particles: Interface radiolysis → High-G-value gas-phase radical retention → Macro-diffusion VOC decomposition.

I. Interface Layer — Explosive Dissociation & Active Ionization Platform

1
INTERFACE LAYER — Explosive Dissociation at “Zero Distance”
Radiolysis at Material Surface / Adsorbed Water Layer
Reaction Scale
Nanometer
Adsorbed Layer
~few nm
Radiolysis Density
Ultra-high
Literature Basis
PuO₂ Study
Primary Products
·OH / H⁺ / e⁻
Interface Layer Detail: α-particle radiolysis of adsorbed water ⁴He ²⁺ u u d 4 MeV Adsorbed Water Layer — H₂O molecules densely adsorbed at surface Radio- lysis ·OH +2.80V ·OH ·OH ·OH H⁺ uud H⁺ H⁺ e⁻ e⁻ Material Surface (PuO₂ research standard) Active Ionization Platform ● Instant ·OH/H⁺ surge — no external power required ● Ultra-high-density radiolysis at interface ● Single α-particle dissociates thousands of molecules ● Validated by PuO₂ interface reactivity studies ● Backed by Geant4 physics simulation
Document Finding: PuO₂ Research Data
As shown by plutonium-oxide surface studies, when an α-particle strikes a nanometer-scale adsorbed water layer on a material surface, ultra-high-density radiolysis occurs at the interface. The LET (Linear Energy Transfer) of a single α-particle reaches hundreds of eV/nm, generating ionization density orders of magnitude beyond that of the bulk liquid phase.
Application: Active Ionization Platform
The interface transforms into an “active ionization platform” that instantaneously emits live radicals (·OH) and protons (H⁺) without any external power source. The released ·OH carries a redox potential of E°=+2.80 V (the second-strongest oxidizer after fluorine) and diffuses immediately from the interface into the gas phase.

II. Gas-Phase Layer — High G-Value Ensures Initial Radical Survival

2
GAS-PHASE LAYER — High G-Value & Cage-Effect-Free Radical Retention
High G-Value in Vapor / No Cage Effect / High Initial Radical Survival Rate
Atmospheric Vapor
1.56 vol%
Track Geometry
Dense Cylinder
Cage Effect
None (gas phase)
Initial Survival
Extremely High
3-Phase Comparison
Gas G-value Max
Gas-Phase Layer Detail: G-value comparison and cage-effect analysis Ionization Track Dense Cylinder α ↓ H₂O H₂O H₂O H₂O ·OH isolated ·OH gas-held No cage effect → escaped recombination → high initial survival rate 3-Phase G-Value Comparison (α irradiation) G-value = molecules generated per 100 eV absorbed Liquid Phase Cage effect present G(·OH) Low Solvation → recombination Relative G: Low Ice Phase Lattice constraint G(·OH) Moderate Mobility limited Relative G: Med Gas Phase ★ No cage effect ★ G(·OH) Maximum ★ Isolated → high survival Relative G: Max ★ G-value (schematic) Liquid Ice Gas ★ Low High 1.56 vol% atmospheric vapor → held at high yield as isolated active species in 30 mm space
Document Finding: 3-Phase G-Value Data
Fundamental radiation chemistry data on the reactivity differences among three phases (liquid, ice, gas) demonstrate that in the gas phase (atmospheric water vapor), where molecules exist in isolation, radicals are free from the “cage effect (solvation)” that would immediately revert them to water. This contrasts sharply with the liquid phase, where even abundant ·OH generated within an α-particle ionization track recombines almost instantly.
Application: Fresh Isolated Active Species
The trace water vapor (1.56 vol%) crossing the 30 mm space is dissociated by α-particle ionization tracks (high-density cylinders) and physically held as “fresh, isolated active species with extremely high initial survival rate” at high chemical yield (G-value) — a state physically substantiated by radiation chemistry theory and the absence of the cage effect.

III. Macro-Diffusion Layer — Spatial Initialization via Fluid Transport

3
MACRO-DIFFUSION LAYER — Domino Effect & Full-Space Initialization
Plume Transport / Domino Effect / Full-Room Initialization
Transport Theory
CTM / Plume-in-Grid
Forced Convection
Circulator Fan
Target Species
VOC / Odor / Bacteria
Mechanism
Domino Effect
Literature Basis
Hanford Site Data
Macro-Diffusion Layer Detail: Plume transport and VOC decomposition Indoor Space — CTM / Plume-in-Grid Model Applied α source 30 mm reaction zone Forced convection (circulator fan) ·OH ·OH ·OH ·OH H⁺ H⁺ VOC Odor Degrade Initialize VOC Bacteria VOC Organics Domino Effect — Chain Electron Stripping ·OH (E°=+2.80V) strips electrons from VOC → Oxidation cascade → Structural breakdown (initialization) Validated by Hanford Site VOC decomposition data Theoretical Basis — Atmospheric Chemical Transport Model (CTM) Deep convection model / Lightning HO_x / Plume-in-Grid theory Local high-density radical band → rapid transport by airflow → full-room scan Full-space initialization beyond radical lifetime — fluid-dynamically proven
Document Finding: CTM / Plume-in-Grid Theory
As demonstrated by atmospheric CTM “deep convection models,” “Lightning HO_x,” and “Plume-in-Grid” theory, locally generated ultra-high-concentration radical bands are rapidly transported by airflow (forced convection) far beyond their intrinsic lifetimes. This is an application of the same fluid-dynamic mechanism at a different scale, valid in the 30 mm indoor reaction zone.
Application: High-Speed Sweep & Initialization
With the addition of circulator airflow, the dense radical plume from the 30 mm zone sweeps across the entire room, launching a “chain electron-stripping domino effect” against floating VOCs, odor molecules, and bacteria, achieving instantaneous structural decomposition (initialization). This dynamic is fluid-dynamically proven, backed by Hanford Site VOC decomposition demonstration data.

Integrated Summary — 3-Layer Model Comparison

Layer Scale Primary Mechanism Key Products Literature Basis Conclusion
Layer 1
Interface		 nm scale Radiolysis at adsorbed water layer ·OH / H⁺ / e⁻ PuO₂ study
Geant4 simulation		 Active ionization platform
— no external power
Layer 2
Gas Phase		 μm–mm scale High-G-value gas-phase retention
cage-effect-free		 ·OH(gas) / H⁺ 3-phase G-value
radiation chemistry		 1.56 vol% vapor held
at high yield in space
Layer 3
Macro-Diffusion		 cm–m scale Plume transport
chain electron stripping		 VOC fragments / CO₂ / H₂O CTM / Hanford Site
VOC decomposition		 Full-room domino
initialization

Scientific Evidence Reference

Interface Radiolysis / PuO₂ Study / Geant4 Plutonium-oxide surface adsorbed-water radiolysis studies and Geant4 physical simulations quantitatively demonstrate ultra-high-density ionization in α-particle–water interactions at interfaces. LET values reach hundreds of eV/nm, generating ionization density orders of magnitude beyond the bulk liquid phase.
3-Phase G-Value Comparison / Radiation Chemistry Foundation Data Established three-phase G-value data (molecules per 100 eV absorbed) for liquid, ice, and gas phases under α irradiation — a standard in radiation chemistry. The absence of the cage effect in the gas phase yields significantly higher initial ·OH survival compared to the liquid phase. Documented in standard references including Spinks & Woods, “An Introduction to Radiation Chemistry.”
Atmospheric Chemical Transport Model (CTM) / Plume-in-Grid Theory Deep convection parameterizations and Plume-in-Grid models implemented in WRF-Chem, CAMx, and related CTMs quantitatively demonstrate that locally generated high-concentration radical bands (e.g., Lightning HO_x) diffuse far beyond radical lifetimes via airflow transport. The identical fluid-dynamic principle applies at indoor scales.
Hanford Site VOC Decomposition / Low-Dose Hormesis Effect VOC decomposition demonstration data (e.g., trichloroethylene) from the U.S. Hanford Nuclear Site provide national-level validation of ionizing-radiation-induced organic compound oxidative decomposition. Additionally, insights on the limitations of the over-conservative LNT (Linear No-Threshold) model and the “low-dose hormesis effect” provide objective safety assurance, making the theoretical framework essentially irrefutable.
上部へスクロール