What is the gamma-ray intensity at one foot from a one curie source of radioactive cobalt-60?

The gamma-ray intensity from a one curie source of cobalt-60 at a distance of one foot is approximately 15 roentgens per hour. This value is derived from the known exposure rates for cobalt-60, which is a commonly used source in radiographic testing due to its gamma radiation emission properties.

Cobalt-60 is a strong gamma emitter, and its exposure rate can be calculated using known factors: for a one curie source, the exposure rate at one meter is about 7.5 roentgens per hour, and this intensity changes based on the distance from the source. When this value is adjusted for one foot (approximately 0.3048 meters), it results in the intensity being about 15 roentgens per hour at that distance.

This precise understanding of radiological measurements and the behavior of different radioactive sources is essential in the field of radiographic testing, as it helps ensure safety and proper interpretation of imaging results.