RPR-00 · laboratory
Inverse square, half-value layer, ICRP weighting, ALARA snapshot.
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41 governing sheets
Ḋ(r) = Ḋ(r0) (r0/r)². Point-source geometric dilution.
GeometryHVL = ln 2 / μ. Thickness that halves a narrow beam.
ShieldingTVL = ln 10 / μ. Thickness that cuts a narrow beam to 10 %.
ShieldingwR(E) from ICRP 103. Photons and electrons are 1; α is 20.
QuantitiesE_T = H_T wT. One organ's share of effective dose.
QuantitiesH = D wR. Absorbed dose scaled by radiation type.
QuantitiesE = H1 w1 + H2 w2 + H3 w3. Whole-body stochastic risk from organ doses.
QuantitiesRF = (t/t0) (r0/r)² 2^{−x/HVL}. Time, distance and shielding versus a reference.
ALARAH = Ḣ T t. Occupied dose from a full-time rate.
Barrier designW_U = W U. Workload aimed at one barrier.
Barrier designW = n D. Patients per week times isocentre dose.
Barrier designB = P d² / (W U T). Allowed primary-barrier transmission.
Barrier designḢ = k Ḣ0 B Ω / d². Roof scatter raining down outside the vault.
ScatterḢ_L = f Ḋ_iso (d_iso/d)². Leakage shall not exceed 0.1 % of primary at 1 m.
LeakageḢ_s = a W (F/400) / d². Scatter from the patient toward a secondary wall.
Scatterx = TVL log10(1/B). Lead (or concrete) needed for transmission B.
Shieldingn = log10(1/B). How many TVLs a barrier must provide.
ShieldingQ = 1 (L<10), 0.32L−2.2 (10–100), 300/√L (L>100 keV/μm). H = Q D.
QuantitiesH*(10) = h*_K K_air. Survey-meter operational quantity at 10 mm depth.
OperationalHp(10) = hp_K K. Badge operational quantity, 10 mm under the badge.
OperationalE(τ) = I e(τ). Intake times the committed effective-dose coefficient.
InternalDAC = ALI / 2400 m³, f = C/DAC. One DAC-year is one ALI.
InternalALI = 0.020 Sv / e(50). Intake that commits 20 mSv.
InternalTI = Ḣ(1 m) / 10 with Ḣ in µSv/h. The package label number.
Transportr = r0 √(Ḣ0 / Ḣ_lim). Inverse-square radius of a dose-rate contour.
ZoningH = Ḣ0 t (r0/r)² 10^{−x/TVL}. The three-lever protection product.
ALARAI = I0 B e^{−μx}, B = 1 + a μx e^{b μx}. Scatter recovered in a broad beam.
Shieldingλ = 1/μ, I = I0 e^{−x/λ}. The 1/e attenuation length.
ShieldingḢ = Γ A / r². Point-source air-kerma rate for a sealed gamma emitter.
Externalt = H_lim / Ḣ. How long until a dose constraint is met.
ALARAn = log2(1/B). How many HVLs a transmission B requires.
ShieldingḢ(r) = Ḣ0 (r0/r)² e^{−μ(r−r0)}. Distance plus a thin air slab.
GeometryNarrow-beam half-value layer.
GoverningTenth-value layer.
GoverningPoint-source air kerma.
GoverningNarrow-beam attenuation.
GoverningNCRP occupancy.
GoverningX-ray room workload.
GoverningPedagogical 10 m reference.
GoverningDerived air concentration.
GoverningAnnual limit on intake.
Governing