Calculator
Radiation Shielding Calculator
Estimate required shielding thickness using unshielded weekly dose, design limit, and tenth-value layer thickness.
Calculator Inputs
Legend
Radiation Shielding Calculator guidance
Required TVLs = log10(unshielded dose / design limit). Shield thickness = required TVLs x TVL thickness.
Input meaning
- Unshielded weekly dose: enter the measured, quoted, or hospital-approved value in mSv/week.
- Design dose limit: enter the measured, quoted, or hospital-approved value in mSv/week.
- TVL thickness: enter the measured, quoted, or hospital-approved value in mm.
Result interpretation
- Use the result as a planning estimate, not as a final approval by itself.
- Record the assumptions used so Procurement, Biomedical, Facilities, Finance, and vendors can review the same basis.
Assumptions
- Radiation shielding design must be performed or approved by a qualified medical physicist.
- Occupancy, workload, distance, beam direction, leakage, scatter, and regulatory limits are simplified here.
Biomedical use
- Use this calculator during RFQ preparation, technical evaluation, acceptance planning, service review, or biomedical workload planning.
How to identify the required values
Use these examples and common working ranges to choose values from gauges, labels, manuals, datasheets, RFQs, service reports, CMMS records, or hospital planning assumptions.
| Field | Example value | Common range | Tip |
|---|---|---|---|
| Unshielded weekly dose | Example: 1 mSv/week. | Use the physicist or design calculation value before shielding. | Use the physicist's unshielded dose estimate. |
| Design dose limit | Example: 0.02 mSv/week. | Use the regulatory design limit for the area classification and occupancy. | Use the design limit for the adjacent area and occupancy. |
| TVL thickness | Example: 5 mm. | TVL depends on kVp and shielding material; use physicist-approved data. | Use TVL data approved by the medical physicist. |
Common ranges are starting points for hospital planning. For final procurement, acceptance testing, electrical design, medical gas design, radiation shielding, dialysis water systems, or clinical use, replace the example values with site-specific data and vendor-confirmed figures.
Input Checklist
Confirm these values before relying on the output for procurement, PM, or service planning.
- Unshielded weekly dose
- Design limit
- TVL thickness
Safety And Engineering Notes
Use calculator outputs as planning estimates and verify critical systems with calibrated measurement or qualified engineering review.
- Radiation shielding design must be performed or approved by a qualified medical physicist.
- Occupancy, workload, distance, beam direction, leakage, scatter, and regulatory limits are simplified here.
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