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Dead time
Useful reference for dead time could be used to improve the article.

Physics and radiobiology of nuclear medicine

Possible improvements include:
 * More information
 * Addition of paralysable/non-paralysable system graph
 * Graphic display of the effect of the two types of counting systems, showing dead time loss

WikiProject Physics Article Assessment feedback
Work up a template for article assessment feedback to provide pointers to take it up to the next grade.

Brewster's Angle Derivation
At a particular angle of incidence, $$\theta_\mathrm B$$ (also known as Brewster's angle), the reflectivity, $$r_\parallel \to 0$$. From the Fresnel equation for the reflectivity of a wave with an electric field polarized parallel to the plane of incidence;
 * $$r_\parallel = \frac{n_1 \cos \theta_\mathrm T - n_2 \cos \theta_\mathrm B}{n_1 \cos \theta_\mathrm T + n_2 \cos \theta_\mathrm B} = 0$$

where $$ \theta_\mathrm T$$ is the angle of transmission.

From this;
 * $$n_1 \cos \theta_\mathrm T = n_2 \cos \theta_\mathrm B$$

Using simple geometry, the condition that the refracted light is perpendicular to the reflected light can be expressed as;
 * $$ \theta_\mathrm B + \theta_\mathrm T = 90^\circ$$

We then obtain;
 * $$n_1 \cos \left ( \frac {\pi}{2} - \theta_\mathrm B \right ) = n_1 \sin \theta_\mathrm B = n_2 \cos \theta_\mathrm B$$

Using trigonometric identities, this rearranges to;
 * $$\frac {\sin \theta_\mathrm B}{\cos \theta_\mathrm B} = \tan \theta_\mathrm B = \frac {n_2}{n_1}$$

Ideal gas
Incorporate alternative version of ideal gas equation:
 * $$P = \frac{\rho R T}{\mu}$$