Free Tools
Browser-only · No server · No data uploaded
Medical Physics Tools
Clinical calculators for radiation dose — built on published standards. All computation happens in your browser; nothing is sent anywhere.
Want these on the go? Radiosh Mobile — free dosimetry simulator on Android · 4.8★
Effective Dose Calculator
ICRP Publication 102 · DLP × k(region, age)
Enter in mGy·cm. From DICOM RDSR or modality dose report.
25
Paediatric k-factors are higher; age interpolated from ICRP 102 Table A.1.
Apply SSDE Correction
AAPM Report 204 — size-specific dose estimate
Measure AP and Lateral at the scan mid-point. Effective diameter = √(AP × Lat). Leave blank to skip SSDE correction.
Standards used: K-factors — ICRP Publication 102 (2007) Table A.1. SSDE conversion factors — AAPM Report 204 (2011) Table B.1, 32cm body phantom / 16cm head phantom. DRL reference — EC Radiation Protection 185 (2014).
Enter DLP, region, and age.
Enable SSDE correction for patient-specific dose.
Shielding Layers
Use sliders to adjust thickness — visualization updates live
Layer 1
primary barrier
Layer 2
click + to add
Layer 3
click + to add
Method: T = (½)^(x/HVL) broad-beam attenuation. Inverse Square Law (dose ∝ 1/d²) applied to source–barrier distance. HVL data: NCRP 151, IAEA SRS 47. Limits: ICRP 103 (20 mSv/yr occupational, 1 mSv/yr public at 2000 h/yr). Reference only — formal assessments require a qualified MP/RSO.
Frequently asked questions
Is my patient data sent to a server?
No. Both the effective dose calculator and the shielding calculator run entirely in your browser — nothing is uploaded, stored, or sent anywhere. No account or sign-up required.
What standards does the effective dose calculator use?
Effective dose is estimated from DLP × age-interpolated k-factors per ICRP Publication 102, with an optional AAPM Report 204 size-specific dose estimate (SSDE) correction using AP/Lat patient diameters. Results are compared against EC RP 185 diagnostic reference levels.
How does the shielding calculator work?
It applies the broad-beam attenuation method, T = (½)^(x/HVL), across up to three barrier layers — lead, concrete, steel, aluminum, water, gypsum/drywall, borosilicate glass, or air — with the inverse square law applied to source-to-barrier distance. HVL data comes from NCRP 151 and IAEA SRS 47, and results are checked against ICRP 103 occupational and public dose-rate design goals.
Are these tools accurate enough for clinical or regulatory use?
They're reference and educational tools. The effective dose calculator uses population-average phantom-based k-factors and doesn't account for organ position or non-standard scan geometry; the shielding calculator uses standard broad-beam HVL data. Formal dosimetry or shielding assessments should be performed by a qualified medical physicist or RSO.
Radiosh Mobile — Free on Google Play
Dosimetry simulator & radiation reference tool for medical physics on the go. ⭐ 4.8 · Used by students, educators and physicists worldwide.