An exposure of 500 roentgens in five hours is usually lethal for human beings.

Contamination level of six hundred roentgens an hour, which is a fatal dose.

The initial radiation emission from Chernobyl was about 200 roentgens an hour.

We caught one shark that measured four hundred roentgens.

Interfax said the maximum dose among firefighters was 0.6 roentgens.

X rays are measured in units called rads and roentgens.

The F-factor can be used to convert between rad and roentgens.

It is being radioactive without giving everyone else on the dais a lethal dose of political roentgens.

Towards the middle of the twentieth century, roentgens were used for the purpose of radiation protection.

They were not mutilated; but two or three thousand roentgens must have sleeted through all shielding.

What if a few roentgens of radiation hasten the process by a few thousand years?"

The standard for radiation exposure to personnel was the same as that used by the Manhattan Project, 0.1 roentgens per day.

Only later we realized what the radiation level was like on that balcony, and how many extra roentgens we were exposed to during our smoke.

Thus the instrument became capable of producing accurate readings to a level of 5,000 roentgens per hour external reading.

In one case, people had received radiation doses of 50 roentgens - four times that of those who had been evacuated from Chernobyl.

Sos was glad, too; he felt the aura of the badlands, and knew that its mystery was more than what could be measured in Roentgens.

Sure, and listen to a lot of mumbo jumbo about roentgens, neutron leakage, and cement patches!

The average acceptable yearly dose for nuclear workers is 2.0 roentgens a year, according to the International Commission on Radiological Protection.

A summary of film badge readings (in roentgens) for July and August, when the largest number of personnel was involved, is listed below:

The label on the box had talked about them being a measuring agent for roentgens, and it was obvious that green meant safe and red meant danger.

If by some pretext I could expose myself to a sufficient number of roentgens ... I sat back in my chair, suddenly excited.

In other words, it converts between the amount of ionization in air (roentgens) and the absorbed dose in tissue (rads).

Even located upon the scaffolding, several feet above the flood, Seven winced at the thought of what the invisible roentgens were surely doing to his own cellular structure.

Exposure rate: a measure of the ionization produced in air by x-rays or gamma rays per unit of time (frequently expressed in roentgens per hour).

A lethal exposure of radiation ranges from 300 to 500 roentgens an hour; levels in the tour areas vary from 15 to several hundred microroentgens an hour.