Most common garter snakes have a pattern of yellow stripes on a brown or green background, and their average total length (including tail) is about 55 cm (22 in), with a maximum total length of about 137 cm (54 in). The average body mass is 150 g (5.3 oz).
Centigray is a radiation absorbed dose measurement unit. A centigray (cGy) is a derived metric (SI) measurement unit of absorbed radiation dose of ionizing radiation, e.g. X-rays. The SI prefix centi stands for one hunfredths.
Polonium 210 (Po-210) is an alpha emitter (a type of ionising radiation) with a half life of about 140 days (meaning its activity will reduce by half every 140 days).In simple terms the 'activity' (given the units of Bq or Becquerel) is a measure of how radioactive a substance is-the more Bq the more radioactive.olonium 210 (Po-210) is an alpha emitter (a type of ionising radiation) with a half life of about 140 days (meaning its activity will reduce by half every 140 days).