Absorbed Dose¶
Absorbed dose is the mean energy imparted by ionizing radiation per unit mass of a specified absorber, measured in gray.
Core Idea¶
Absorbed dose is mean energy imparted by ionizing radiation divided by the mass of a specified absorber: \(D=d\bar{\epsilon}/dm\) locally. Its SI unit is gray, with \(1\,\mathrm{Gy}=1\,\mathrm{J/kg}\). The receiver matters: source activity or incident beam energy alone is not dose in a tissue or device.[^ref-48c73796979a]
Scope of Application¶
In radiopharmaceutical therapy, IAEA Table 10.2 reports a published ¹⁷⁷Lu PSMA-617 study's organ-mass-corrected coefficients of 0.6 ± 0.2 Gy/GBq for kidneys and 1.0 ± 0.6 Gy/GBq for salivary glands. These are study-level averages, not individual prescriptions; a point dose and organ mean answer different questions. In electronics, NASA's Samsung DDR2 test reports ⁶⁰Co irradiation to 1.1 Mrad(Si), with supply-current failure criteria near 150 and 400 krad(Si) preceding the first functional failure at 900 krad(Si). The silicon-qualified physical dose does not itself dictate one universal device threshold.[ref-1d3efbf0e542][ref-5f5a25a40629]
Clarity¶
Absorbed dose rate is not a synonym for absorbed dose: rate is \(dD/dt\), in Gy per unit time. Nor is absorbed dose the same as equivalent or effective dose; ICRP applies radiation and tissue weights to relevant organ doses for protection purposes. Effective dose is not an exact individual risk estimate.[ref-1d3efbf0e542][ref-ea2ca9553e0e][^ref-d18814480639]
Manages Complexity¶
Dose reduces a radiation transport history to a local physical quotient. That aids comparison, but a single average can conceal hot spots, time course or radiation quality. NASA's LM111 comparison demonstrates the time caveat: at equal total dose, 0.01 rad(SiO₂)/s exposure produced more input-bias-current degradation than 50 rad(SiO₂)/s exposure followed by matched-time annealing. Report the material and spatial basis, and keep a distribution or rate when the decision requires it.[ref-1d3efbf0e542][ref-5f5a25a40629]
Abstract Reasoning¶
For fixed deposited energy, doubling the receiving mass halves average dose. If 1 J is uniform across 1 kg, the average is 1 Gy; if concentrated into 0.1 kg, that subregion averages 10 Gy while the whole-kilogram summary can remain 1 Gy. This is a measurement example, not treatment guidance.[^ref-1d3efbf0e542]
Knowledge Transfer¶
The quotient transfers literally from tissue to electronics because both absorb ionizing energy per mass. Biological protection weights do not transfer to silicon oxide. Ratio supplies the general numerator/denominator structure; radiation deposition in a specified absorber makes the named quantity domain-specific.
[^ref-48c73796979a]: IAEA, Radiation Oncology Physics: A Handbook for Teachers and Students, §2.5, especially Eq. 2.10 and kerma/dose distinction. [^ref-1d3efbf0e542]: IAEA, Dosimetry for Radiopharmaceutical Therapy, §2.5, Eqs. 2.4–2.5; §10.3.3.4, Table 10.2, printed p. 258. [^ref-5f5a25a40629]: NASA NEPP, Single-Event and Total Dose Testing for Advanced Electronics, §4.2, p. I-29; §5.2 Fig. 23, printed pp. I-37–I-38; §5.3 Fig. 25, printed p. I-39. Figures reproduce studies cited therein. [^ref-ea2ca9553e0e]: ICRP, Publication 92, abstract on organ absorbed dose and radiation weighting. [^ref-d18814480639]: ICRP, Publication 147, abstract on use and limits of effective dose.
Relationships to Other Abstractions¶
Current abstraction Absorbed Dose Domain-specific
Parents (1) — more general patterns this builds on
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Absorbed Dose is a kind of Ratio Prime
Absorbed dose specializes a ratio as ionizing-radiation energy imparted per absorber mass.
Hierarchy path (1) — routes to 1 parentless root
- Absorbed Dose → Ratio → Comparison → Self Checking
Neighborhood in Abstraction Space¶
Absorbed Dose sits in a sparse region of the domain-specific corpus (74th percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Nuclear Physics & Isotope Phenomena (17 abstractions)
Nearest neighbors
- Radiation — 0.87
- Equivalent Dose — 0.86
- Opacity — 0.83
- Radiation protection — 0.82
- Solar energy conversion — 0.82
Computed from structural-signature embeddings · 2026-10-08