. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. I. Roentgenogram of Hand, Made at 40 Distance. 100 , 6 inch back up. 40 MILLIAMPERES. 10 SECONDS EXPOSURE. deep effect, heavy filters would be necessaryto cut out the preponderant radium beta orshort range rays, and then an exposure of agreat many hours would be necessary topermit the gamma rays to functionate in amanner equal to the five-minute .^--rayexposure already noted. Bearing this in mind, and recalling thatradiums greatest source of energy lies in Itspreponderance of beta radiation or shor
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. I. Roentgenogram of Hand, Made at 40 Distance. 100 , 6 inch back up. 40 MILLIAMPERES. 10 SECONDS EXPOSURE. deep effect, heavy filters would be necessaryto cut out the preponderant radium beta orshort range rays, and then an exposure of agreat many hours would be necessary topermit the gamma rays to functionate in amanner equal to the five-minute .^--rayexposure already noted. Bearing this in mind, and recalling thatradiums greatest source of energy lies in Itspreponderance of beta radiation or shortrange rays, it is easy to understand why aradium dermatitis is more evanescent than aroentgen dermatitis. A radium dermatitis isjust like an intense solar erythema. It. Fig. 2. Three Tubes Radium Element, 25 milli-grams EACH, Contained in Original SilverTube, no other Filter, Placed over Lead StripsOne, Two and Three Millimeters Thick, Re-spectively. All Placed on Light Proof Photo-graphic Negative. Exposure One Hour. Notelimit of visible radio-activity, also actinicshadows and secondary ray effects. Fig. 3. Lead Strips Placed on Negative Under-neath Patient. A-ray Exposure of 25 Minutes with Coolidge Tube, so calledErythema Dose Applied to Surface. Note in-tensive reduction of silver on negative not cov-ered by lead, also clear cut shadows of these. Fig. 4. Lead Strips Placed on Negative Under-neath Patient. Exposure through Body. OneHundred Milligram Hours incomplete actinic action on plate emulsion,and rather dull shadows of lead plates, the latterdue to secondary ray effects in the lead. 104 Further Comments on Radio-Activity would follow an exposure by a so-called soft;ir-ray tube working under low voltage. In
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