04 Protection
Equivalent dose
H = D × w_R. Radiation weighting turns gray into sievert.
Listen
Listen · English
Simulation
Equivalent dose — Change the numbers; the scene follows.
Where it works
Treatment vault
Primary barrier
In the bunker maze and barriers — time, distance, TVL, WUT, and weekly controlled-area dose.
Open this machineFormula
Typical values
Variables
Results
H
Equivalent dose
1mSv
H
Equivalent dose
0.001Sv
Explanation
What it means
Equivalent dose H = D w_R puts different radiations on a sievert scale. ICRP 103: photons and electrons w_R = 1, protons 2, α and heavy ions 20, neutrons a function of energy (≈ 2.5–20). This is a working relation in Radiation protection.
Where it is used
Clinically it sits on the Treatment vault — Primary barrier. In the bunker maze and barriers — time, distance, TVL, WUT, and weekly controlled-area dose. Protection equations are the wall, the occupancy factor, and the badge: time, distance, shielding, and WUT. They turn a room into a legal design.
Treatment vault · Open this machineHow to use it
Enter absorbed dose in mGy (equals mSv for photons). Use the neutron preset only as a rough mid-range value — look up w_R(E) for a real neutron spectrum. Change one input and watch the curve and the simulation follow.
Symbols
- DAbsorbed dose1 mGy
- w_RRadiation weighting factor1
Worked example
A typical case from the default values: D = 1 mGy (Absorbed dose); w_R = 1 (Radiation weighting factor). Substituting into the relation gives H = 1 mSv; H = 0.001 Sv. These are teaching numbers — align them with your machine.
Typical values give
- H = 1mSv
- H = 0.001Sv
Where it comes from
The displayed formula is the working relation. H = D × w_R. Radiation weighting turns gray into sievert. Usual reference: ICRP 103. Derive it in the specialty lesson, then return here to pin the numbers.
Reference: ICRP 103
Assumptions & limits
Whole-body / organ absorbed dose already averaged. Does not include tissue weighting (that is effective dose). Quality factor Q is the older ICRU sibling.
Pitfalls
Tenth-value layers are for the broad beam in that material and that energy — not a photocopy from another bunker. Occupancy T is not a guess; it is a use pattern. Inverse-square fails against a large scatter source. Whole-body / organ absorbed dose already averaged. Does not include tissue weighting (that is effective dose). Quality factor Q is the older ICRU sibling.
Keep this
Time, distance, shielding — in that order — then calculate the wall. Whole-body / organ absorbed dose already averaged. Does not include tissue weighting (that is effective dose). Quality factor Q is the older ICRU sibling.
In this specialty