Cos'e il difference tra activity e dose?

Activity (Bq, Ci) measures decay rate di un source—disintegrations per secondo. Dose (Sv, rem) measures energy absorbed da tissue e biological effect. A high-activity source puo give low dose if far away o shielded. Dose depends on activity, distance, shielding, exposure time, e radiation type.

How do I calcolare activity da mass?

A = λN = (ln2/t½) × (m/M) × Nₐ, dove m e mass, M e molar mass, Nₐ e Avogadro's number, e t½ e half-life. Shorter half-life means higher specific activity (activity per grammo). 1 grammo di Ra-226 (t½ = 1600 y) ≈ 1 Ci; 1 grammo di I-131 (t½ = 8 giorni) ≈ 124,000 Ci.

Cos'e half-life e how does it relate un activity?

Half-life (t½) e il time per half il radioactive atoms un decay. Activity decreases da half every half-life: after 1 t½, 50% remains; after 2 t½, 25%; after 10 t½, ~0.1%. Half-lives range da fractions di un secondo (Po-214: 0.16 ms) un billions di anni (U-238: 4.5 billion anni). Short half-life = high activity but quick decay.

Perche do nuclear medicine e industry still usare curies?

Historical inertia e convenient scale. Il curie era established before SI units e e deeply embedded in US regulations, equipment calibrations, e medical practice. Convertendo documentation e retraining sarebbe be costly. Il curie also ha convenient magnitude per many applications—mCi doses sono common in nuclear medicine imaging.

Attività radioattiva Converter

Informazioni Radiation Activity Conversione

Radioactivity (o activity) measures il rate di radioactive decay—il number di nuclear disintegrations per unit time. It quantifies how "active" un radioactive sample e, regardless di il type di radiation emitted o its energy. Activity tells you circa il source itself, not circa il hazard it poses: un highly active source di weak beta emitters puo be less dangerous than un lower-activity gamma source. Comprendere activity e essential per handling radioactive materials, planning nuclear medicine procedures, e managing radioactive waste.

Il SI unit e il becquerel (Bq), equal un one disintegration per secondo. Il older unit curie (Ci) e still widely used, especially in medicine e industry—named after Marie e Pierre Curie e originally defined da il activity di 1 grammo di radium-226. Activity decreases exponentially con time according un il decay law: A(t) = A₀ × e^(-λt), dove λ = ln(2)/t½. Half-life e il key property relating activity un time.

Our converter handles radioactivity units used in nuclear physics, nuclear medicine, e radiation safety.

Comuni Radiation Activity Conversions

Da	A	Moltiplica Per
Ci	Bq	3.7 × 10¹⁰
Bq	Ci	2.703 × 10⁻¹¹
mCi	MBq	37
MBq	mCi	0.027
μCi	kBq	37
kBq	μCi	0.027
Bq	dps	1
Ci	dpm	2.22 × 10¹²

Radiation Activity Unita Riferimento

Becquerel (Bq) – Il SI unit di radioactivity, named after Henri Becquerel who discovered radioactivity in 1896. 1 Bq = 1 nuclear disintegration per secondo. Il becquerel e un tiny unit—even un banana contains circa 15 Bq di potassium-40. Comuni multiples: kBq (10³), MBq (10⁶), GBq (10⁹), TBq (10¹²). Nuclear medicine doses typically range da MBq un GBq.

Curie (Ci) – Historical unit still widely used in US medicine e industry, named after Marie e Pierre Curie. 1 Ci = 3.7 × 10¹⁰ Bq = 37 GBq esattamente. Originally defined as il activity di 1 grammo di radium-226. A large unit: 1 Ci e un significant radioactive source requiring careful handling. Comuni submultiples: mCi (10⁻³ Ci = 37 MBq), μCi (10⁻⁶ Ci = 37 kBq), nCi (10⁻⁹ Ci = 37 Bq), pCi (10⁻¹² Ci = 0.037 Bq).

Disintegrations per minuto (dpm) – Direct misurazione unit per laboratory counting. 1 Bq = 60 dpm esattamente (60 secondi per minuto). Liquid scintillation counters often report results in dpm. Also written as d/min. Related: disintegrations per secondo (dps) = Bq.

Specific activity – Activity per unit mass (Bq/g o Ci/g). Shorter half-life means higher specific activity: 1 grammo di I-131 (t½ = 8 giorni) ha circa 4.6 PBq activity, while 1 grammo di U-238 (t½ = 4.5 billion anni) ha only 12.4 kBq.

Rutherford (Rd) – Obsolete unit occasionally found in older literature. 1 Rd = 10⁶ Bq = 1 MBq esattamente. Named after Ernest Rutherford. Rarely used in modern practice.