HPCalc

Disclaimer: This software is for radiation protection education, screening calculations, and professional support only. It does not replace qualified health physicist judgment, regulatory requirements, approved procedures, emergency response tools, or formal shielding design review. Exposure, absorbed dose, equivalent dose, and effective dose are distinct quantities; do not equate R and Sv without explicit context and assumptions.

HPCalc

v1.0.0-alpha.3

Health Physics Calculations with Confidence

Calculate. Document. Defend.

Theme: Shielded Precision

Screening · Training · Documentation support

Calculate, visualize, document, and explain radiation safety problems using transparent formulas, assumptions, warnings, and report-ready outputs.

Modules & resources

Product roadmap

Active, prototype, and planned modules by domain.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Decay

Activity vs time using bundled half-lives; screening and documentation.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Point source

Inverse-square dose rate from activity and gamma constant; stated geometry assumptions.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Time / distance

Dose or rate scaling with time and distance factors; not occupancy modeling.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Shielding

Narrow-beam attenuation (HVL/TVL); optional custom μ with audit fields.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Unit converter

SI and traditional radiation and survey units; optional converter report.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Contamination & surveys

Wipe, direct frisk, skin screening worksheet, and survey statistics.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Internal dose

Intake, ingestion, inhalation, DAC-hours, and ALI fraction screening.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Spectroscopy

Energy/efficiency calibration, ROI activity, FWHM, and MDA-style screening.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Waste / decay-in-storage

Decay-in-storage, ten half-lives, inventory worksheet, and survey checklist.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Air sampling & DAC

Sample volume, concentration, DAC fraction/hours, filter count, grab worksheet.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Nuclides

Bundled catalog with confidence labels and half-life display.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Training Academy

Modules and quizzes; progress stored in the browser only.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Help

Scope, exports, accessibility, and per-calculator guidance.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

About

Version, limitations, data confidence, and accessibility stance.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Regulations

Reference cards and pointers; no reproduced regulatory text.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

Reports

Copy, JSON, Markdown, and print views of validated payloads.

Screening / documentation — not a substitute for licensed programs or formal dose assignment.

App status

Application: HPCalc v1.0.0-alpha.3
Environment: Production
Report schema version: 1.0.0-alpha.3
Release phase: Alpha — education, screening, documentation support, and professional review workflows only
Calculator hub modules: 10 calculators linked from the hub and dashboard
Bundled datasets: Nuclides: 20 · Materials: 11 · Regulatory refs: 19
Validation & accessibility testing: Typical release: npm run lint, npm run test, npm run build, and npm run test:a11y (Playwright structural smoke + rendered contrast on listed routes). See CHANGELOG.md for last recorded counts. Run npm run build before test:a11y when .next is stale.
Accessibility posture: HPCalc targets Section 508 / WCAG AA accessibility practices, but should not be represented as fully 508 compliant until a formal accessibility audit is completed.
Dataset validation summary: 3 checked · 3 fully valid · 0 with messages · ~0 invalid row(s) reported
nuclides: 20 rows
materials: 11 rows
regulatoryReferences: 19 rows

The full safety disclaimer appears on every page in the header. Reports use Zod-validated payloads and JSON export envelopes; bundled nuclide, material, and regulatory JSON are checked at load. Physics formulas remain in /lib/physics.