Translation Results Requested Through Conyac Made Public

5.1 OPERATING THE CIRCUIT THE FIRST TIME:

Clamp the circuit box back together and turn the switch to the X10 scale. Make certain that the sliding beta window of the probe is closed. Wait thirty seconds for the system to reach stability. The indicator should remain substantially at zero.

Open the window on the probe and present it to the center of the calibration source whicih is a beta radiation sample. The indicator should fall between 1.5 mr/hr and 2.5 mr/hr, averaging about 2mr/hr.

5.2 CARIBRATION:

NOTE:　The beta source must constitute the sole source of radiation when calibration is performed. Calibration must not be undertaken when the background is above normal or
when the probe is in a radiation field other than that produced by the known beta source supplied with the instrument.

If the indication falls above or below this range, it may be corrected by the screw-driver adjustment inside the box which is marked "CAL". Advancing the adjustment clockwise increases the reading.

5.3 SCALE RANGES:

There is only one control on this instrument for the operator to use. It is the range control, comprising an "OFF" position and three ranges labeled, "X100,X10, and X1". These respectively are both 100 times, 10 times and 1 time the scale reading in milliroentgens per hour and counts per minute shown on the meter. This scale is 0.5 milliroentgen per hour and 300 counts per minute respectively with the major divisions all indicated on a 50-division scale.


5.4 USING THE HEADPHONES:

If the operator chooses to use a headphone with the instrument, it is screwed into the connector provided immediately to the left of the handle. The yellow plastic protective cap is removed. In using the headphone, the operator will note that each pulse arriving at the instrument is indicated by a distinctively audible "click" in the headphones.



5.6 CHECKING CALIBRATION:
The operator should periodically check the calibration fo the instrument to verify that it is correct. This operation is described in paragraph 5.2.
5.5 NORMAL BACKGROUND:

Since normal background of radioactivity is of the order of 0.01 to 0.02 milliroentgens per hour, little activity will normally be observed. Under background conditions only about 20 per minute of these clicks occur and they are randomly spaced so that one may wait for several seconds before any click is observed and then there may be two or three in rapid succession. Very accurate measurements of background and other low level radiation can be made by counting headphone clicks and timing with a watch which ha a second hand. The procedure is to count a given number of counts and observe the time required to obtain these counts.
The radiation rate in counts per minute is the number of counts divided by time in minutes. Table I gives the number of counts that are required to provide a given percentage error where percent standard error is defined as that error for which in 68 cases out of 100 the true error will not exceed the given percentage error. The nine-tenths error is that error for whicht the true reading is no different from the observed reading within the given percentage limits for 90 cases out of 100.

5.6 CHECKING CALIBRATION:
The operator should periodically check the calibration fo the instrument to verify that it is correct. This operation is described in paragraph 5.2.