What type of dosimeter provides an immediate reading of exposure?

• A. Film badge dosimeter
• B. Pocket dosimeter
• C. OSL
• D. Thermoluminescent dosimeter

Answer: (B)

A pocket dosimeter is designed to provide immediate readings of exposure. This type of dosimeter typically contains a small ionization chamber and has a visual display, often resembling a pen. When the dosimeter is exposed to radiation, ionizing events occur within the chamber, allowing the user to see the accumulated dose directly on the dial or display, giving instant feedback.

In contrast, other dosimeters such as film badge dosimeters, optically stimulated luminescence (OSL) dosimeters, and thermoluminescent dosimeters (TLDs) do not provide immediate readings. Film badges require development of the film to visualize exposure, while OSL and TLDs need specific processing to read the dose after exposure, making them less suitable for situations where immediate feedback on radiation levels is necessary.