What Dosimeter Should I Use for Personnel Monitoring?
What dosimeter should I use for personnel monitoring?
Table comparing some common dosimeters used for personnel dose assessment.
|Radiation detected||x, γ, ß, n||x, γ, ß, n||x, γ, ß||x, γ, ß|
|Sensitive medium||Crystalline AgBr in gelatinous matrix on plastic substrate. Grain size and density vary for neutron track film vs. ß-γ film.||Crystalline thermoluminescent material, e.g., LIF (Mg, Ti), LiF(Mg, Cu, P), CaSO4 (Dy or Tm), Li2B4O7 (Cu)||Crystalline optiluminescent material, e.g., Al2O3(C)||Usually silicon diode, some use small G-M tube.|
|Dose range||100 µSv–5 Sv||100 µSv–10 Sv
(10 µSv possible)
|10 µSv–10 Sv||1 µSv–10 Sv|
(x and gamma)
|5 keV–3 MeV||5 keV–6 MeV||5 keV–10 MeV||50 keV–6 MeV|
|Advantages||Relatively inexpensive; long-term visual record; provides visual image of exposure pattern.||Rugged; environmentally stable; good range; relatively rapid processing (in-house); allows infrequent readout (three months and up to one year for some); can be reused multiple times; Li phosphors have good tissue equivalence.||High sensitivity, multiple rereads possible; rapid readout; some dose imaging possible; rugged; environmentally stable; allows infrequent processing (up to one year); can be reused multiple times.||Very high sensitivity; real-time response; can display rate and integral dose; preset alarm; can provide time history of dose; can offer remote readout and computer manipulation.|
|Disadvantages||Subject to environmental influences (temp. and humidity); requires frequent processing; processing usually requires outside vendor and is relatively slow; requires filtration to account for energy dependence; fast neutrons below about 700 keV are not measured; insensitive to beta radiation below a few hundred keV.||Cannot be reread; requires capital expenditure (for in-house processing); the Ca phosphors require filtration to account for energy dependence; neutron sensitivity of albedo dosimeters decreases sharply with increasing energy.||Requires large capital expenditure (for in-house processing); vendor-supplied dosimetry likely more expensive than other vendor-supplied dosimetry.||May be subject to EM interference; may require considerable capital expenditure.|
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